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In any gregarious social animal, there is a hierarchy in the group largely centred around sexuality. I would venture to suggest that SOME subordinate animals of social species (eg. wolves, lions, meerkats, great apes) are to some degree asexual. They don't particularly contest the alpha animals because they don't particularly care if they get to mate or not.
Animals with backbones are called vertebrates. They include all types of fish, as well as amphibians such as frogs and newts, reptiles, birds, and mammals, including humans. Animals without backbones are called invertebrates. They include corals, jellyfish, snails, all kinds of worms, and insects, among many others.