An automatic animal feeder includes a bowl, a base unit which accepts the bowl, a lid which may be closed to cover the bowl and prevent access to it, or opened about a hinge to allow access to the bowl, a lid control mechanism capable of keeping the lid closed, or opening the lid, the bowl including a profile on its outer surface, on the side furthest from lid hinge, and a base unit including a corresponding profile on its inner surface. The bowl profile and the base profile interlock when the bowl is positioned in the base unit, such that the side of the bowl with the profile is constrained against being lifted substantially vertically.
