TUCSON, Ariz.— The Center for Biological Diversity filed suit today against the U.S. Fish and Wildlife Service for failing to finalize Endangered Species Act protections for the cactus ferruginous ...

For the past seven years a UA researcher has camped out in northern Mexico during the hot summer months looking for owl pellets and excrement. Aaron Flesch, a senior research specialist in the School ...

A nonprofit that specializes in protecting endangered species filed legal challenges with a US District Court on Thursday, accusing the Federal Highway Administration (FHA) of failing to comply with ...

PHOENIX — Two environmental groups filed a lawsuit Tuesday aimed at forcing the federal government to protect Arizona’s diminishing cactus ferruginous pygmy owl population under the Endangered Species ...

A Tucson environmental group filed suit Thursday to try to force the federal government to move faster on protecting the once-endangered pygmy owl and a flock of other species it says are imperiled.

An owl native to southern Texas and Arizona and northern Mexico is under threat from climate change, changing conditions and habitat fragmentation and loss. The U.S. Fish and Wildlife Service listed ...