TIL that vampire bats will die if they can't find blood for two nights in a row. Luckily, generous well-fed bats will often regurgitate blood to share with others, in exchange for grooming. This has been noted by many naturalists as an example of reciprocal altruism in nature.

https://en.wikipedia.org/wiki/Vampire_bat#Ecology_and_lifecycle



Submitted March 27, 2015 at 03:20AM by Donkey_-_Dong http://www.reddit.com/r/todayilearned/comments/30f7vr/til_that_vampire_bats_will_die_if_they_cant_find/