Added Hamsters. These can be tamed and bred with Pumpkin, Wheat, and Beetroot Seeds. They will also search for and pick up any dropped seed items in their mouths.
Hamsters sleep through the day and night, and are active during dusk and dawn.
Tamed Hamsters can be picked up by shift-right-clicking them with an empty hand and can be placed back down.
Added Hamster Wheels -- crafted with Copper Ingots and Stone Slabs. Hamsters will occasionally ride these.