The Mexican Cycadian (Eumaeus toxea) is a striking and distinctive butterfly native to western Mexico, where it is closely associated with native cycad plants, particularly species of Dioon. Medium-sized and boldly patterned, it is best known for its dramatic coloration: the wings are deep velvety black marked with vivid turquoise to white spots or bands, while the abdomen and portions of the thorax are often a conspicuous bright red or orange, signaling toxicity. This warning coloration reflects the butterfly’s biology—both the larvae and adults sequester toxic compounds from their cycad host plants, making them unpalatable to predators. The caterpillars are especially notable, being bright red with rows of black spines, and they often feed openly in groups on cycad leaves. Adults fly deliberately and close to the ground, frequently seen around their host plants in tropical dry forest and woodland habitats.