The animal kingdom is home to millions of species that crawl, swim, fly, and gallop across Earth. From deep-sea dwellers to backyard birds, different types of animals help us understand evolution, ecosystems, and our place among other living things.

1. Mammals

Mammals are warm-blooded animals that typically have hair or fur and feed their young with milk. Humans, dogs, and horses all belong to this group. Most mammals have four legs and give birth to live young, though there are exceptions like the egg-laying platypus.

2. Birds

Birds are defined by feathers, beaks, and the ability to lay eggs. Many can fly, but not all; ostriches and penguins are flightless. Birds and crocodilians (such as crocodiles and alligators) share a common ancestor, making them evolutionary cousins. Birds i

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