evolution
Hawkmoths evolved ultrasound defences against bats several separate times
Male hawkmoths scrape specialized scales to answer a hunting bat with ultrasound, and a new family tree shows the trick arose at least four…
Bird songs across 350 species follow three rules of human speech
A McGill team compared 70,000 song units from 350-plus bird species with speech and song in 52 languages, and learning to sing made almost…