Animals can count?

[Catherine]

Crows can count and other clever birds like Blue Jays as well. I suspect dogs and cats know how many cans of their food are in the cupboard. 

I think many mother animals know how many babies they have. I don't know if they count them, but they do know if the count is off.

The guinea pigs know how many veggies they get with each feeding. They also know when. I suspect they have a clock hidden somewhere. I just can't find it.
The new boys have decided that they want an extra hay feeding before they go to sleep. They have decided when I should deliver this hay. I can either give them more hay when they ask or listen to them demanding until I give in. 
So far they haven't figured out how to tell if I am awake. I am hoping the older piggies don't tell them or I will have to get up and feed them earlier than I want to. They are too clever those new boys.