Squirrel monkeys and male baboons will gesture with an erect penis as a threat to predators or as a sign of impending danger.

Frog-eating bats identify edible frogs from poisonous ones by listening to the mating calls of male frogs. Frogs counter this by hiding and using short, difficult to locate calls.

The cross bow was invented by the Chinese and records of its usage goes back to as far as the Three Kingdom Period (220 a.d.-280 a.d.).

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