Now, it's a little hard to see, becasue that painting is so old, but, if I'm not mistaken, Judas looks like he might have been a velociraptor. Why would Jesus trust a velociraptor you may ask? Well, Jesus pretty much trusted everyone which might have been his problem. Anyways, there are other clues to this fact as well. See below.
If you look at the angle between Jesus and John (or Mary, but I'm not going to get into that, as neither of them were dinosaurs) it makes the shape of a "v". "V" is for "Velociraptor" and that, my friends, is all the proof I need. Just for kicks, I searched the bible for references to Judas, and astonishingly, this is what I found.
Mark 14:10 says, "Then Judas Iscariot, who was one of the twelve, went to the chief priests in order to betray him to them. " Now, I don't know what "Iscariot" means, but I'm assuming it has something to do with being a dinosaur.
Mark 14:43 says, "And immediately, while he was still speaking, Judas came, one of the twelve, and with him a crowd with swords..." The term 'swords' in this passage is obviously referring to the sickle shaped claw that the velociraptor sported on its feet.
I honestly thought I'd have more trouble proving the dinosaur theory, but, if something's true, then it's true, and uncovering that truth really shouldn't be all that difficult.