Fascinating article about why viruses, like the current Corona virus outbreak, tend to come from bats.
Why Bats? They are mammals, so sufficiently close to us, not domesticated, and live in huge flocks
Bracken Cave, in Texas, is home to roughly 20 million breeding Mexican free-tailed bats, similar to the (human) population of the Mexico City urban area. In places there are 500 bat pups per square foot on the wall. To a virus that represents a tasty buffet.