Anyone know what's up with this? Common butterfly cold, or what? Another from The Florida Museum of Natural History...

Have'nt got a clue payn, not up on these little creatures, perhaps he has his dinner stuck to his face!? excellent closeup though.

Hmmmmm..... I did a search on it but didnt really find anything to help. It is a nice photo either way!!

It's got rabies :p

Seriously, I have no clue either. Just guessing, it may have something to do with prep for egg laying. Interesting shot.

Looks like he's been at the cuckoo spit.
Nothing to do with cuckoos :)
It's a frothy protective covering secreted by some bugs while feeding on plants.
The butterfly probably wouldn't have been feeding on it/them but could just have walked into it and picked it up.