Close-up photo of an infestation of yellowish aphids on the back of an oleander leaf.

Oleander aphids (Aphis nerii) sequester cardenolides (oleandrin) from Nerium oleander (& other hosts in the milkweed family). These bright orange aphids can form large colonies & have nothing to fear from most potential predators. 📷: Clive Freedman CCBY4 #Asclepiaceae #Aposematism #Botany 🌾🧪🌱

Close-up photo of an orange and black bug perched on the orange flowers of a milkweed.

The large milkweed bug (Oncopeltus fasciatus) feeds on Asclepias spp. (milkweeds) & sequesters their cardenolides, making itself distasteful to predators. 📷: Martin LaBar CCBYNC2 #Asclepiaceae #Aposematism #Botany 🌾🧪🌱