Vampire bats can consume 50% of their weight in blood

Costas

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making them too heavy to fly. So when feeding on liquid rich blood they begin urinating almost immediately.

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

ref - https://www.reddit.com/r/todayilearned/comments/f7j5jj/til_vampire_bats_can_consume_50_of_their_weight/
 
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