1.   A pack of Mexican gray wolves, an endangered species reintroduced into Arizona, attacked a domestic cattle calf on a ranch north of Clifton.

2.   The people for whom the species are being reintroduced can be a problem as well.

3.   This common-sense proposition has long led conservation biologists to concentrate on core areas as they delineate habitats to protect, or sites to reintroduce species.

4.   If that happens, wildlife officials would have to decide whether to reintroduce the species to the original Great Lakes habitats.

5.   Small had acknowledged that work on five projects to reintroduce endangered species to the wild might have to come to an end with closure of the Virginia center.

6.   Zoo work on five projects to reintroduce endangered species to the wild may have to come to an end, said Small.