Hopefully 'you'! Humans are animals too

A mosquito.

12

9+6 = 15; 8+8 = 16, then 17
3+1 = 4; 0 + 5 = 5, then 6
3+7 = 10; 9 +2 = 11, then 12

Twenty. You counted the same horses coming and going

9

6 ÷ 2 = 3, 1 + 2 = 3
3 (3) = 9

Because the light was supposed to guide the ships.

You would turn one light switch on leave one off and turn on one for a minute then turn it off so when you go upstairs you see one on you feel one cold and feel one warm.

A hare brain!

He has a green thumb.

Fire

Once, because after you subtract it's not 25 anymore.

The word “not”.