Hello!
I have placed a grid of 3x3 item filters all setup like this:

I wanted cows and chikens to fall trough the blocks when placed on top. But it does nothing. Also I dont know what item to represent the different animals, but I guess those should work. Does it also know if the animal is adult or not?

rftools-1.12-7.14

That's not what the filter does. It filters items. Not entities. i.e. items that are piped in with conduits from nearby chests