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Animal Behavior

Kissing Behavior Social Behavior Chimpanzees Kissing Monogamy Alcohol Metabolism Canids Social Interactions Sleep Patterns Paternal Investment Primates Self-Medication Communication Social Bonding Cognition Social Structures Tool Use in Animals Neurology Homosexuality in Animals Alcohol Ingestion Domestication Human Behavior Flocking Dynamics Vocal Learning Tool Use Mating Systems Reproductive Success Defensive Coloration Facial Muscles Rhythm Perception Same-Sex Behavior Pair Bonds Ant Behavior

Major Review Finds Same-Sex Sexual Behavior Common in Primates, Linked to Social and Environmental Pressures

Researchers caution that the patterns suggest social benefits without proving a fitness advantage.

Jellyfish and Sea Anemones Without Brains Shown to Sleep

Humans Rank Seventh in New Mammal Monogamy Study, Below Beavers and Above Meerkats

Study Traces Primate Kissing to a Common Ape Ancestor 16–21 Million Years Ago

PNAS Study Links Chimp Territorial Killings to Short-Term Reproductive Gains

Female Mountain Gorillas Use Long-Term Bonds to Navigate Group Transfers

Wild Orangutans Nap to Offset Sleep Lost to Social Nesting

Chimpanzees Catch Yawns From Android Head