On earth, there is a similar morphology for the limbs of land animals from amphibians on up to mammals. What if on other planets environmental pressure allowed for different limb arrangements? This hairless mammal like critter from another planet has limbs that are good for catching prey in it's nut-cracker like "legs" and "arms". Once immobilized it then feeds on their gooey insides with a mosquito like proboscis. It would be fast too, with a springy leap-frog type run.