World's biggest bat colony gathers in Zambia every year: we used artificial intelligence to count them

Everybody who visits Kasanka National Park in Zambia during "bat season" agrees that the evening emergence of African straw-coloured fruit bats from their roost site is one of the wildlife wonders of the world. The bats (Eidolon helvum) arrive at Kasanka every year around October. The numbers swell rapidly until they peak in November. By January they are gone again. Once they recover from the shock of the breathtaking spectacle, everyone also converges on the same question – how many bats are there?