Once upon a time lived a cat and bird. The cat was starving, so when she spotted the bird in the nest, she started climbing the tree. Then the bird saw the cat and told her, "If she leaves the birds, she will help the cat get down." The cat said, "Ok, but how will a little bird help?" Then the cat suddenly fell. The bird flew and grabbed the cat and escorted it to safety. The cat thanked the bird. 
The size does not matter. 