From One Green Planet:
A record number of 22 captive-born Mexican wolf pups have been released into the wild to be taken care of by surrogate wolf parents. During April and May, nine wolf pups were fostered in three different packs in eastern Arizona, and thirteen wolf pups were fostered in five packs in New Mexico.
For six years, Mexican wolf pups have been raised in captivity and released to foster parents. This not only helps to boost the genetic diversity of this species but also helps to move the population towards a safer number.