To find all 3 animals is easy. They're all hidding in different parts of nature.

The Butterfly hides in pushes, left-click on a bush, and a butterfly will fly out.

The Fish hides in the water of a pond, left-click on the pond and a fish will hop out.

The squirrel is a little odd, it hides inside a Big Hedge Arch, left-click on the arch, and a squirrel should peak out of it. NOTE: It's only the BIG hedge arch, NOT the small on.

There you go, now you've found all the animals, and now you've got your trophy!