Recent mortality events affected 14 species of bird and fruit bats  in South Africa when maximum air temperatures exceeded 43-45℃ in 2020 . Passerine birds seem more vulnerable to lethal hyperthermia, due to the relative inefficiency of panting to lose heat  and also their small size, as heat tolerance generally increases with body mass . Several mass mortality events of flying foxes  have occurred in eastern Australia when maximum air temperatures exceeded 42° . Nineteen such events occurred between 1994 and 2008, compared to three events prior to 1994. In January 2002, maximum temperatures exceeded the 30-year average mean daily maximum by up to 16.5° and killed >3500 individuals . In 2014, an estimated 45,500 flying foxes died in
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report