I learned it from Fantastic Mr Fox:

https://www.youtube.com/watch?v=j2vHk9aJUm8

But they eat what's available, and most of their prey isn't out running around during the hottest days of the year, but they are likely to be in/around food sources like a blueberry bush.

If not, might as well eat some blueberries.

Vegetarian/carnivore isnt binary in nature tho. Animals specialize, but none of them are turning down a free meal. Deer, goats, cows, and pretty much every herbivore won't hesitate to chomp down on a bird or a small rodent given a chance. Especially domestic livestock.

It just has to be bite sized.