Skippers are often mistaken for moths because they are small, and sometimes are without the more intricate patterns of other butterflies (but I think they are very beautifully marked and coloured). You can tell skippers from other butterflies by the hook in their antennae (really, the curved apiculus). Their bodies are shorter and much stouter than other butterfly groups too, as you can see if you look at the photos below.

New photos at the beginning.