Peruvian desert mice: water independence, competition, and breeding cycle near the Equator.

The native mouse of the Peruvian coastal desert, near latitude 6 degrees S, can survive on dry seed without drinking water, it bears young in winter, and it burrows in sand. House mice (which abound in other adjoining deserts) also tolerate dehydration, and in some areas may displace the native mice.

Rank of mothers and sons in bands of rhesus monkeys.

In bands of free-ranging macaques, adolescent males typically leave their mothers in the central part of the band and assume low social rank at the periphery. But the adolescent sons of high-ranking mothers may remain central and rise to high rank without becoming peripheral.