Jungle Monkeys have very low health and will die from one shot of any weapon, no matter the round. However, you may not want to kill these monkeys immediately, as they can help you turn bad drops into good ones if you are skilled enough. They will always run after and steal drops, cycling through all available drops as they escape.

This means you can let it steal something like a Fire Sale and wait for it to cycle to a Max Ammo and kill the monkey to get that drop. This is because whatever Power-Up the monkey was cycled on when killed will be dropped by the monkey.