ANIMALS

Animals fill the world we live in!

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Discover Animals By Species

Scientists estimate that we share the planet with 7.7 million – yes million – other species of animal, and the vast majority have yet to be discovered! There are dozens of ways to group animals, but it is simplest to start with six basic animal groups, which include amphibians, birds, fish, invertebrates, mammals, and reptiles.

Amphibians

Amphibians emerged about 370 million years ago. They are typically born in water with gills, but undergo a metamorphosis that allows them to breath air and live on land as adults. They are particularly sensitive to their environments, and can serve as “canaries in the coalmine” for ecological disturbances.

Birds

Current scientific consensus is that birds are the world’s last surviving dinosaurs, though they are warm-blooded and have four-chambered hearts like mammals. True birds began showing up about 100 million years ago; they all have feathers (though not all can fly), lay eggs, and have toothless beaks.

Fish

If it has a skull and backbone, gills, and its limbs (if present) are fins, it is probably a fish. But fish are actually a collection of several populations, such as lampreys, ray-finned fish, and sharks – animals of wildly different shapes, sizes and behaviors. A few even spend much of their lives on land!

Invertebrates

As the name suggests, invertebrates are animals that do not possess a vertebral column (spine or backbone). With just one feature to define them, this makes for a huge group of animals: insects, snails, octopuses and many more. In fact, invertebrates make up 97% of all living animals on the earth!

Mammals

Mammals are the only animal on earth with real hair, but that’s far from their only defining feature! Mammals are warm blooded, birth and nurse their young (with a few exceptions), and their brains possess a neocortex. Humans, who like to think they are the smartest animal, are mammals -- as are the largest known animals to ever live (the Blue Whale)!

Reptiles

Reptiles are ectothermic vertebrates who possess watertight scale or scute-covered skin, and (usually) lay hard-shelled eggs. Reptiles first appeared about 315 million years ago and are still plentiful today, with many types of crocodiles, lizards, and snakes serving as easily recognizable representatives.