Plaintiff-appellee Coastal Plains Feeders, Inc.1 operates a commercial feed lot near Samson, Alabama where it holds cattle for their owners and fattens them for market. Defendant-appellant insurance companies2 issued “floater” policies to Coastal Plains insuring the cattle it held against loss by “theft, but excluding escape or mysterious disappearance.” In this diversity action3 Coastal Plains sued the companies on the insurance contracts to recover the value of 512 cattle that vanished from its feed lot. Coastal Plains also sought an additional $50,000 compensatory and $100,000 punitive damages for the insurance companies’ allegedly tortious refusals to pay the claims.
The district court dismissed Coastal Plains’ latter claims for failure to state a cause of action under Alabama law. After trial a six person jury found for Coastal *450Plains on the contractual claims in the amount of $172,657.48. The district court entered judgment for that amount plus $9,064.54 interest.
The insurance companies appeal the judgment, arguing (1) that the district court incorrectly instructed the jury as to the elements that Coastal Plains had to prove to recover; (2) that there was insufficient evidence of theft to present a jury question on liability; and (3) that there was insufficient evidence of the cattle’s value to support the damage award. Coastal Plains cross appeals, complaining that the district court erred in dismissing its claims for compensatory and punitive damages for the companies’ refusal to pay on the policies. For the reasons stated herein, we affirm the district court in all respects.
I. FACTS.
Coastal Plains put on evidence showing that in late 1973 and early 1974 it held about 7,000 cattle in its feeder pens near Samson. On December 21, 1973 Lawrence Systems, Inc., which issued warehouse receipts for the cattle held by Coastal Plains, made a rough head count indicating that no cattle were missing from the Samson lot. Lawrence records also showed that it could account precisely for the cattle belonging to each owner who withdrew cattle from the lot before December 23, 1973. Each owner’s cattle were inventoried into separate pens by exact head count. When an owner withdrew his cattle, the number withdrawn plus the number of deaths4 plus the number previously withdrawn always added up to the number that the owner had delivered. In addition, some owners counted their own cattle at the lot, and before December 23 none found any shortages.
In late January of 1974 Coastal Plains became concerned because the amount of feed the cattle were consuming was abnormally low. Its nutritional and veterinary consultants found nothing wrong with the feed or cattle, however, and the drop in consumption was attributed to rainy weather. When consumption continued to be low through February, some owners became worried. On March 10 Coastal Plains conducted an exact head count of all the cattle at the lot. This count revealed, and the parties stipulated, that 512 cattle were missing.
Searches of the surrounding countryside, investigation by law enforcement officers, and offer of a $5,000 reward turned up neither hide nor hair of the missing cattle. Some light was shed on their disappearance, however, by three members of a family who lived on a lonesome dirt road leading to the back pens of the feed lot. They testified that on a number of occasions between December and March they saw an unmarked empty double-decker (“possum belly”) cattle truck going up the road toward the lot at dusk without headlights. They also heard a heavy diesel truck return down the road in the early hours of morning. None of them ever saw such a large truck on the road before or since.
The back pens to which the dirt road led were not locked, and the heaviest loss of cattle was from those pens. The night watchman, who quit in February, could not see or hear anything happening at the back pens. Two men could load as many as 70 cattle into the kind of truck the family saw in a short time. Coastal Plains’ fences were in good repair, and it had never had a problem with cattle straying or escaping.
II. THE INSURANCE COMPANIES’ APPEAL.
A. Instructions on theft and mysterious disappearance. The insurance policies provided that the companies would be liable for the loss of cattle “through theft, but excluding . . . mysterious disappearance.” The insurance companies contend that, under Alabama law, Coastal Plains carried both the burden of proving that theft was the cause of the loss, and the burden of proving that mysterious disappearance was not the cause of the loss.5 *451They further contend that the district court erred in failing to instruct the jury that Coastal Plains carried the latter burden as well as the former. We find it unnecessary to decide whether the burden of disproving mysterious disappearance was on Coastal Plains rather than the insurance companies; for assuming that it was on Coastal Plains,6 the district court’s instructions sufficiently apprised the jury that Coastal Plains was required to disprove mysterious disappearance in order to recover.7
The district court did not just tell the jury that Coastal Plains must carry the burden of proving theft to recover under the policy. Rather, it told the jury repeatedly that Coastal Plains must prove that theft, and not mysterious disappearance, was the cause of its loss:
[Defendants deny that Coastal Plains suffered any loss covered under these insurance policies since Coastal Plains has by the evidence shown nothing more than a mysterious disappearance of cattle and . a mysterious disappearance of cattle is not covered or compensable under these policies.
Appendix at 245 — 46.
[The insurance policies . . . provide that Coastal Plains is insured against theft, but not escape or mysterious disappearance.
Appendix at 247.
The policies of insurance here in question provide insurance for theft, but exclude escape or mysterious disappearance .... The burden of proof of theft, as I have told you, is on Coastal Plains, the plaintiff. That burden of proof is to reasonably satisfy you from the evidence that the loss in fact resulted from a theft or thefts.
Appendix at 249. The district court defined “mysterious disappearance” as “disappearance under unknown, puzzling, and baffling circumstances which arouse wonder, curiosity, or speculation, or under circumstances which are difficult or hard to explain.” Ap*452pendix at 249.8 Thus, although the district court correctly charged that Coastal Plains could prove theft through circumstantial evidence,9 it also made it clear to the jury that Coastal Plains had to prove something more than “mysterious disappearance,” so defined, to make out a circumstantial case of theft. This amounted to an instruction that under the policy, Coastal Plains had to “negate mysterious disappearance” to prove “theft.”
The district court rejected the insurance companies’ request to charge explicitly that Coastal Plains carried two burdens — that of proving theft, and that of negating mysterious disappearance — on the ground that this could confuse the jury. The court apparently wanted to avoid misleading the jury into thinking that it was logically possible for Coastal Plains to prove theft without negating mysterious disappearance, as it had defined that term.10 We think this was a proper concern. The fact that the insurance contracts were drawn in confusing language does not justify instructing the jury in confusing terms — especially at the instance of the parties responsible for the source of the confusion.11 We hold that to inform the jury adequately that Coastal Plains carried the “burden of negating mysterious disappearance” as well as of proving theft, it was necessary only to define “mysterious disappearance” in the generally accepted manner, see text and note at note 8 supra; and then to emphasize that Coastal Plains would be entitled to recover only if it proved theft, as distinguished from mysterious disappearance so defined.
*453B. Sufficiency of the evidence of theft. The insurance companies argue that the district court erred in denying its motions for directed verdict and for judgment notwithstanding the verdict, on the ground that Coastal Plains’ evidence was insufficient to prove theft of the cattle. The rule in this circuit is that “in diversity cases federal courts apply a federal rather than a state test for the sufficiency of evidence to create a jury question.” Boeing Company v. Shipman, 411 F.2d 365, 368 (5th Cir. 1969) (en banc); see generally 5 Moore’s Federal Practice ¶ 38.10. Considering “all of the evidence — not just that evidence which supports the non-mover’s case — but in the light and with all reasonable inferences most favorable to the party opposed to the motion[s],” 411 F.2d at 374, we conclude that Coastal Plains made out a sufficiently strong case of theft to get to the jury.
Coastal Plains presented evidence tending to show that, the disappearance of the cattle was not due to death, sale or reclamation by owners, straying, or miscounting. We need not decide whether this evidence by itself would support an inference that the cattle were stolen, compare Lovas v. St. Paul Insurance Companies, 240 N.W.2d 53 (N.D.1976) (evidence of theft of hogs held sufficient) with Baugher v. Hartford Fire Insurance Company, 214 Kan. 891, 522 P.2d 401 (1974) (evidence of theft of cattle held insufficient); Gifford v. M.F.A. Mutual Insurance Company, 437 S.W.2d 714 (Mo.Ct.App.1969) (evidence of theft of cattle held insufficient); Raff v. Farm Bureau Insurance Company, 181 Neb. 444, 149 N.W.2d 52 (1967) (evidence of theft of hogs held insufficient); for here Coastal Plains also showed that an unmarked cattle truck was seen at night near the inaccessible back pens of the feed lot during the period in which the cattle disappeared, adding strength to the theory that the cattle in fact were stolen. See Wiley v. United Fire & Casualty Company, 220 N.W.2d 635, 636-37 (Iowa 1974) (evidence of theft of cattle held sufficient on facts nearly identical to instant case); Gifford v. M.F.A. Mutual Insurance Company, supra, 437 S.W.2d at 717 (suggesting that evidence of theft would have been sufficient if someone had seen “a strange truck traveling to or from where the cattle were kept,” or had “heard any unusual activity at night near the pasture” where the cattle were kept; or if there was “evidence of [someone] being at or near the cattle under suspicious circumstances”). To hold that the jury could not reasonably infer from this evidence that the cattle were stolen would render meaningless the rule that Coastal Plains could prove theft through circumstantial evidence. See text and note at note 9 supra. We hold that the district court did not err in submitting the ease to the jury on the issue of liability.
C. Sufficiency of the evidence of value. Although the insurance companies do not brief the issue, they state that an issue presented for review is whether Coastal Plains presented sufficient evidence of the amount of damages to take their case to the jury. Coastal Plains, of course, bore the burden of proving the amount of its damages; the jury could not be left free to speculate as to this amount. Great American Insurance Company v. Railroad Furniture Salvage, Inc., 276 Ala. 394, 400, 162 So.2d 488, 493 (1964).
The insurance policies provided for recovery of the “actual cash value [of the cattle] on the date of loss,” less a deductible of $50 per head up to $5,000 per occurrence. Coastal Plains showed the weight of the cattle when they were delivered to the feed lot. It also showed that the cattle gained an average of two pounds each a day at the lot. Finally, it showed that cattle were selling from 48 to 50 cents a pound at the time of the loss.
To arrive at its requested damage figure, Coastal Plains calculated the total weight of the cattle on March 9, the day before the loss was discovered, by adding two pounds per day per head up to that date to the cattle’s weight when delivered. It then multiplied this figure times the price per pound that it had shown, and subtracted $5,000, the maximum deductible for a single “occurrence.” The jury awarded precisely the amount that Coastal Plains requested, $172,657.48.
*454Although the insurance companies do not specify in what particulars they think the evidence of value was insufficient, we suspect they object to Coastal Plains’ fixing of the day before the loss was discovered as the “date of loss” for purposes of calculating the weight and value of the cattle, and to its characterization of the loss as a single “occurrence” for purposes of applying the deductible. The evidence, summarized in Part I above, tended to show that the theft was accomplished sometime between December 23, 1973 and March 10, 1974, perhaps over a number of nights; hence, the cattle might have been stolen before March 9, and there might arguably have been more than one “occurrence” of theft.
We do not think, however, that Coastal Plains should be barred from recovery merely because it could not pinpoint more precisely the date or dates on which the cattle were stolen. Theft often is committed surreptitiously and often goes undetected for some time. Where proof of the value of stolen property turns partly on proof of when the property was stolen, we think it is proper to allow some leeway for approximation in establishing the date of loss. Cf. New Amsterdam Casualty Company v. W. D. Felder & Company, 214 F.2d 825, 827-28 (5th Cir. 1954) (holding evidence of value of cotton samples stolen by plaintiff’s employees over period of time, based on estimated weight and average price of cotton stolen, sufficient to support recovery on fidelity bond). We therefore hold that Coastal Plains’ evidence of the amount of its loss was sufficient to support the verdict.
III. COASTAL PLAINS’ CROSS APPEAL.
Coastal Plains argues that the district court erred in dismissing its second and third causes of action for failure to state a claim under Alabama law. Fed.R.Civ.Pro. 12(b)(6). The second cause of action alleged that in denying its claim, the insurance companies breached an implied duty to deal fairly and in good faith with Coastal Plains.12 The third cause of action alleged that they acted oppressively and in bad faith in denying the claim.13 Each cause of action sought $50,000 compensatory and $100,000 punitive damages, in addition to the recovery sought under the policy itself in the first cause of action.
Coastal Plains recognizes that there is no precedent in the Alabama Supreme Court or Court of Civil Appeals to support a cause of action for damages resulting from an insurance company’s wrongful refusal to pay a claim. It relies heavily on an Ala*455bama trial court opinion, Woodall v. Old Southern Insurance Company (Circuit Court of Russell County, Civ.No. 5826, Feb. 10, 1975), which upheld a cause of action in tort seeking compensatory and punitive recovery for damages resulting from such a refusal, and on a line of cases from other states which recognize such causes of action. See generally Annot., 47 A.L.R.3d 314 (1973). As the insurance companies are quick to point out, however, this branch of Woodall has been reversed by the Alabama Supreme Court. Old Southern Insurance Company v. Woodall, 295 Ala. 235, 326 So.2d 726 (1976).
In Woodall the insured purchased a hospitalization policy on November 1,1972 which stated that losses resulting from certain ailments
shall be covered only if such disease, disorder, or sickness originates (becomes manifest by the symptoms usually associated therewith) and begins after the effective date and loss occurs no less than six (6) months after the effective date of this policy.
295 Ala. at 239, 326 So.2d at 728. On May 27, 1973 the insured became ill and entered the hospital with what the insurer claimed was one of the specified disorders.14 The insurer denied liability for this and for a subsequent hospitalization on the ground that the disorder had originated less than six months after the policy was issued.
The insured died and her husband sued the insurer for compensatory and punitive damages on a variety of theories, including that the insurer had “willfully and corruptly den[ied] liability under the contract.” Id. at 239, 326 So.2d at 728. The jury returned a general verdict for plaintiff, and the trial court denied the insurer’s motions for new trial and for judgment notwithstanding the verdict. The Alabama Supreme Court reversed and remanded. Although it did not absolutely rule out the possibility of stating a cause of action for an insurer’s wrongful denial of liability,15 the court held that on the record before it the claim for wrongful denial of liability “simply charges that the company committed a tort in maliciously and fraudulently refusing to pay a claim under the policy. Without more, this claim sounds in contract.” Id. at 243, 326 So.2d at 732. Hence, it failed to state a claim distinct from one on the insurance contract upon which relief could be granted.
The Woodall court found its case legally indistinguishable from Hamner v. Mutual of Omaha Insurance Company, 49 Ala.App. 214, 270 So.2d 87 (1972), cert. denied, 291 Ala. 781, 282 So.2d 256 (1973). In Hamner an insured sued her insurer for refusing to pay on a hospitalization policy, charging inter alia that the refusal was “oppressive, malicious and fraudulent” and demanding compensatory and punitive damages for the refusal.16 The Court of Civil Appeals up*456held the trial court’s sustaining of the insurer’s demurrer to this count, holding that the plaintiff
is attempting to allege an action in tort arising out of a breach of promise in a policy of insurance. We do not think there is any foundation for such action in the laws of this State.
[The count] attempts to charge a tort arising from a denial of a claim under a policy of insurance. Such act by appellee, if wrongful, amounts only to a breach of a promise to perform and could only be complained of in an action for breach of contract, [cite]
The manner or intent of such breach does not change the form of action, nor as a general rule, add damages not ordinarily recoverable in a breach of contract action, [cites]
49 Ala.App. at 217-218, 270 So.2d at 90.
The basis of the holdings in Hamner and Woodall appears to be the Alabama rule that a tort action will not lie if the wrong complained of consists of failure to perform a contract, e. g., nonfeasance. See Berry v. Druid City Hospital Board, Ala., 333 So.2d 796, 799-800 (1976); Hamner, supra, 49 Ala.App. at 217, 270 So.2d at 90. The Alabama Supreme Court has recently described Woodall as a case where it had to decide whether the insurer’s denial of liability was misfeasance or nonfeasance in order “to determine whether [an action] in tort [was] available to the plaintiff where he clearly had a cause of action for breach of contract.” Berry, supra, 333 So.2d at 800.17 Thus, no tort cause of action was available in Woodall because the insurance company’s denial of liability constituted nonfeasance.
We find Coastal Plains’ complaints in the instant case indistinguishable from the plaintiffs’ in Woodall and Hamner. 18 In all three cases the wrong complained of is an allegedly wrongful denial of liability under a contract of insurance, which in Alabama’s view constitutes nonfeasance. In all three cases the plaintiffs could attempt to recover on the insurance contract itself, as plaintiff here successfully has done. We hold that, on our reading of Alabama law, the district court did not err in dismissing Coastal Plains’ second and third causes of *457action for failure to state claims upon which relief could be granted.
AFFIRMED