Just following their natural instincts to protect their leftovers from scavengers. Benni is the worse one for doing it in the catuary but Zara tries too if there is a blanket nearby her food bowl. Benni has shown her son how to do it so if she doesn't bury their leftovers he will. Tinka even tries it occasionally.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!