So over the past couple of months my son has gone from having interest only in animals to loving anything with wheels and now being totally into construction. His current favorite shows are the newest Bob the Builder, Blaze and the Monster Machines and Dinotrux. His favorite toys are trains, construction vehicles and a toy drill with giant plastic screws. He's gone from smashing block towers to building them and even enjoys Duplos now. It's pretty amazing to see. He still loves his kitties and duckies and always wants his dad to show him owls on the internet, so I can proudly say he's broadened his interests more than changed them.