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Crocodile roars – and moos – could help conservationists monitor populations of species that are hard to track through visual surveys.

The big-eyed, tiny-bodied African dwarf crocodile (Osteolaemus tetraspis) prowls the dense forests and narrow streams of West Africa. But the species is very hard to spot and extremely difficult to count. Ů��С��Ƶs assume that it is quite common, however, because the tiny crocodiles show up in the bushmeat trade a lot.

“There’s still enough of them to be caught and sold, but that also means there’s probably quite a big conservation threat for them,” says …