A swallowtail coat is waist length in the front and sides, and has two long tails reaching to the knees in back - this is probably where the swallowtail butterflies get their names. These are from the Papilionidae family that includes the largest butterflies of the world. Here are a couple of swallowtails that I found in Taman Negara.
Four-barred swallowtail
These butterflies are known to have anatomical differences from the rest of the butterflies, like the catterpiller having an extra organ - osmeterium behind its head, but the only apparent difference that I could use is the very obvious and distinctive swallowtail extension that the adults have in their hind wings. But I now read it is not even mandatory for all the swallowtails to be tailed - Talk about identifying butterflies!
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