Snake in a plane:

 

http://alert5.com/2012/09/21/snake-goes-hiding-inside-mig-21/

that remembers me about a Vietnam War tank story. Jungle, hot and humid environment, because that a M-48 with open hatches, a monkey falls from a trunk on the tank turret, the monkey, nervous, goes bananas, fast scratchs and bites the crew members, the crew flees and abandon the tank ....

(I think I readed it on "Armor of Vietnam War", by Zaloga).