The one on the left is named Dinoraptosaurus.
The one on the right...he's the newer guy. He's had a number of names, and we can never seem to remember any of them. Currently, Alex has named him Cricket Catcher. Which is pretty accurate.
They're both males, and when Cricket Catcher arrived on the scene, they did NOT get along. The were constantly doing all sorts of macho lizard posturing at each other. But at some point that changed, and now they're pals.
Which is good, because Cricket Catcher has grown to be a much bigger lizard than when we got him (he was the same size as Dinoraptosaurus) and he could probably make himself an only lizard if he were so inclined.
And wouldn't that be an interesting bit of reality for the children to experience.