The Mexican gray wolf appears to be extinct in the wild and exists now only in captivity and as a reintroduced population in southeast Arizona and southwest New Mexico. A recent study did not find evidence for inbreeding depression in juvenile viability or litter size in captive animals. Here we found that captive wolves with little or no known inbreeding had lower body size than wild-caught wolves. In addition, captive wolves with higher inbreeding had lower body size than captive wolves with little or no in…
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