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Extant Cambrian first appearancesTerreneuvian first appearancesVertebrates

Vertebrate

Adapted from Wikipedia · Explorer experience

Examples of vertebrates: a sturgeon fish, African elephants, a tiger shark, and a river lamprey.

What Are Vertebrates?

Vertebrates are special animals that have a backbone and a skull. The backbone protects the spinal cord, and the skull protects the brain. They belong to a big group called Chordata. Vertebrates come in many shapes and sizes, from tiny frogs to huge whales. They can live in water, like fish, or on land, like mammals and birds.

Types of Vertebrates

There are several main groups of vertebrates. These include mammals, birds, amphibians, reptiles, and many kinds of fish. Fish can be jawless, like hagfish, or have jaws, like sharks and bony fish. Some bony fish evolved to have limbs and moved onto land, becoming the first four-legged animals, called tetrapods.

Where Did Vertebrates Come From?

Vertebrates first appeared a very long time ago during the Cambrian explosion, about 518 million years ago. The earliest ones had a simple body with a head and tail but no jaws. Later, in the Devonian period, jawed fish appeared. Some of these fish developed limbs and moved to land, leading to the first amphibians in the Carboniferous period. Over time, mammals and dinosaurs appeared, and dinosaurs later evolved into birds in the Jurassic period.

Why Vertebrates Are Important

Vertebrates are very important because they are all around us. They help keep nature balanced. For example, birds help control insect numbers, and fish are a food source for many people. Scientists study vertebrates to learn about life on Earth and how animals have changed over millions of years. Today, many vertebrate species are facing challenges, but people are working hard to protect them and their homes.

Images

A dinosaur skeleton on display at the Museum für Naturkunde in Berlin.
Close-up view of the gill arches of a Northern Pike, showing how fish breathe underwater.
An artistic drawing of Acanthostega, one of the earliest four-legged animals, showing its unique features as a transitional creature from water to land.
An artistic reconstruction of Hyperodapedon, a Triassic-period reptile, shown in a natural pose.
A fossilized bird from the Eocene period, displayed at the Field Museum of Natural History in Chicago.
A scientific sketch showing Richard Owen's idea of the basic body plan shared by all vertebrates.
A scientific diagram showing how fish have evolved from the time of the Cambrian period to today, with the width of each section indicating the number of fish families alive at that time.
A magnified view of a European lancelet, a small marine creature studied in biology.
Illustration showing the structure of a salp, a transparent sea creature.
Illustration of a lamprey fish from Idun's Cookbook.
Illustration of a great white shark by Duane Raver.
A common carp fish, also known as Cyprinus carpio, shown on a white background.
An artistic illustration of a coelacanth, a fascinating deep-sea fish.
An artistic restoration of Haikouichthys, one of the earliest known vertebrates, helping us learn about ancient life on Earth.

This article is a child-friendly adaptation of the Wikipedia article on Vertebrate, available under CC BY-SA 4.0.

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