Monarch Butterflies & Milkweed
Milkweed produces toxins to deter animals from eating them, monarchs have become immune to the toxins. Eating milkweed has helped monarchs evade predation due to the toxins staying in their bodies as adults. The colors on monarchs is called aposematic coloration which lets predators know that they do not taste good.
Top photo: Bill Thompson
Bottom photo by Courtney Celley/USFWS