
Large Milkweed Bug - Oncopeltus fasciatus
Orange and black bug that has orange forward-pointing triangles anteriorly and orange backward-pointing triangles posteriorly, separated by a black band in the middle.
These bugs accumulate toxins from milkweed, which can sicken any predators foolish enough to ignore the aposematic colors that warn of their toxicity.

The milkweed bug, "Oncopeltus fasciatus", is a medium–sized hemipteran of the family Lygaeidae. It feeds mainly on grains, particularly those of the milkweed. Like all hemiptera, it feeds through a long mouthpart known as a rostrum. "O. fasciatus" is commonly used in science due to ease of rearing and ease of dissection.