Yes, they do! If you happen to be in the Caribbean and park your car under a tree - given how hot it usually is, you'd be very keen to park in the shade... well, the next morning you'll be highly likely to see your car covered in iguana excrement. Big, big splashes of it!! Here I was, sharing with Ms W, who likes all animals under the sun, some animal trivia facts, something I've learnt the hard way. It cheered Ms W. up...😀