UCLA biologists, colleagues solve mystery contemplated by Charles Darwin.

Ever since the Falklands wolf was described by Darwin himself, the origin of this now-extinct canid found only on the Falkland Islands far off the east coast of Argentina has remained a mystery.

In the Cerrado region of Brazil, four dogs trained to detect animal feces by scent are helping researchers monitor rare and threatened wildlife.

By TINA FIRESHEETS GREENSBORO Fewer than 100 maned wolves live in the United States, and two are expected to arrive in Greensboro this week. The sibling wolves -- Luna and Nena -- will reside in a half- acre exhibit simulating a South American grassland habitat at the Natural Science Center.