How many legs does a butterfly have?

How many legs does a butterfly have? Check it out. (You can select a picture to enlarge it for better inspection.)

Cabbage White	Clouded Sulphur
Male tiger swallowtail	Female Peck's skipper

These butterflies (well, (technically a skipper is not a true butterfly, but it's still in the order Lepidoptera) clearly have six. Duh, right? They’re insects.

But what about these guys?

Monarch	Common Buckeye
Red-spotted purple (southern colormorph of the White Admiral	Red Admiral

The first is, of course, a monarch, and the last three are all brushfoots. They seem to have four!

Brushfoots have vestigial forelegs, and monarchs have slightly larger ones, but still small and kept tucked up near their heads.

Cool, huh? And startlingly obvious when you look at them - really look, that is. Yet somehow I managed to make it through more than half a century without noticing...