Humidity and heat are killers for tropical birds: Waxbill and hornbill studies highlight the dangers

Humans are not the only species negatively affected by increasingly hot and humid conditions. Intense heat waves sometimes kill large numbers of wild animals. Eastern Australia's giant fruit bats, known as flying-foxes, provide possibly the most dramatic illustration. In late 2018, two days of extreme heat in the far north of Queensland wiped out one third of Australia's population of spectacled flying-foxes. The species is now red-listed as endangered.