All the Animal orbs locations.(Contains spoilers.)
Q: Where do I get the Boomerang?
A: Bring the Cardinal to the Thieves Forest. When you get to the part where the owl is taking a crap, the Cardinal will go behind the bush under the owl and get you the boomerang.
Q: Where do I get the shovel?
A: Right in the beginning of the Desert level, next to a small sand castle.
Q: Where do I get the horn?
A: You get it by beating the Corn boss in the Marsh.