My son went through a phase of being utterly obsessed with dinosaurs. It actually helped a bit with his speech – once you’ve managed to pronounce pteranodon, ankylosaurus, brachiosaurus etc, you’re well on the way to being able to talk like a normal person.
For ages, my son’s favourite dinosaur was Tyrannosaurus Rex. He took him everywhere and sometimes slept with him. This creates a problem – toys that get left in random places are often toys that you can’t find. Although, my son is less attached to this one, particular, bit of molded plastic, it really bugged me that we couldn’t find it. It wasn’t in the cupboards. It wasn’t in the dinosaurs-and-other-creatures box. It wasn’t in the drawers in his bedroom and it wasn’t next to the bath.
I ended up finding it in a random bag of stuff somewhere in the living room. I was extremely pleased about this but I don’t think he was all that bothered.