These aphids (Aphis gossypii) took refuge on a clown beetle during a rain storm. I took the hister beetle from the puddle to look at the pollen on it's back. This is what I found. Aphids don't typically eat clown beetles, so that's where I draw the conclusion that they are hitchhikers even though they don't have their own towels. Photo taken with iPhone 5 and 17mm telescope eyepiece.