That is not a mistake. That's not my entry for the unattractive contest. I truly believe this lady is beautiful. Just look at her dress. It's one of nature's finest art.
This 'Lady' is a Green-headed Tree Snake [Leptophis mexicanus] aka Mexican Green Snake, Mexican Parrot Snake.
She lives in our trees. She is harmless. She eats Mosquitoes, Roaches and other bugs including a nasty wood eating critter. What's not to like on her?

Camera Konica-Minolta Dimage Z2, hand hold
Focal Length 46mm
F# F/3.2
Exposure 1/160 sec
ISO 200