Milkweed aphids (Aphis nerii), on desert milkweed (Asclepsias subulata). Like other milkweed consumers, these aphids ingest and accumulate compounds from the host plant that make them unpalatable or toxic to predators. Their bright color is a signal: “I’m dangerous and nasty, don’t fuck with me.”

I think I’ll wear yellow today. 

Milkweed aphids (Aphis nerii), on desert milkweed (Asclepsias subulata). Like other milkweed consumers, these aphids ingest and accumulate compounds from the host plant that make them unpalatable or toxic to predators. Their bright color is a signal: “I’m dangerous and nasty, don’t fuck with me.”

I think I’ll wear yellow today. 

Small milkweed bug* (Lygaeus kalmii) on desert milkweed (Asclepias subulata). At the Desert Botanical Garden in Phoenix, Arizona.

Please click photo for full view.

*In this case “small” is part of the bug’s common name, and not just a modifier I’ve tacked on as a literary flourish.