This butterfly pupae makes a very convincing snake. According to Nerdist, it not only looks like a scary viper, it also can sense nearby movement and will wiggle to scare predators away. The caterpillars/butterflies are native to Trinidad. Interestingly, the Gaboon pit Viper, which is appears to be imitating, is not.
Nature is neat.
Interestingly, the butterfly itself isn’t as fancy. Clearly most of the work went into the cocoon.