Multiple theories for the decline of Easter Island's civilization may be complementary.
Hover fly cuticles are covered in tiny spikes called nanopillars.
Conservation efforts have increased China's tree cover.
Risk of infanticide quickens monkeys' development.
A new genetic program for cell death has been identified.
Brown skuas can recognize individual humans.
Air at the Earth's surface warms more quickly at night than during the day.
Singing with a mate can promote monogamy in birds.
Fear of predators can keep intermediate prey species in check.
Laterality in fish may be guided by their anatomy.