animals
- Why Do Whales Sing? Song, Mating and Communication
Whales sing mainly to communicate. Male humpback whales produce long, structured songs in breeding grounds, probably to attract mates and signal to rival males. - Unihemispheric Sleep: Sleeping with Half a Brain
Dolphins, seals, and some birds sleep one brain hemisphere at a time — what the EEG shows, why voluntary breathers and vulnerable sleepers evolved it, and what it says about sleep itself.