Attacus atlas, the Atlas moth, is a large saturniid moth endemic to the forests of Asia. The species was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.
The Atlas moth is one of the largest lepidopterans, with a wingspan measuring up to 24 cm (9.4 in) and a wing surface area of about 160 cm2 (≈25 in2). It is only surpassed in wingspan by the white witch (Thysania agrippina) and Attacus caesar, and in wing surface area by the Hercules moth (Coscinocera hercules). As in most silk moths, females are noticeably larger and heavier than males, while males have broader antennae.
An Atlas moth (Attacus atlas) rests on a tree trunk with its wings closed. A bird, hoping for a snack, creeps closer, until it's within striking distance. Just as it’s about to pounce, the moth’s wings spring open—and bam! Instead of a moth, the bird suddenly sees not one, but two snake heads. Confused and startled, the bird flies away—and the moth gets to live another day.
Atlas moths are perhaps most famous for the markings on the upper corner of their wings, which bear an uncanny resemblance to cobra heads (in profile). While not all entomologists are convinced of that visual mimicry, there is some convincing evidence. Cobras live in the same part of the world as these moths, and the moth’s main predators—birds and lizards—are visual hunters. Plus, species related to the Atlas moth have similar but less defined versions of the snake’s head, showing a pattern that could have been fine-tuned by natural selection.
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