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about 65 million years ago

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

Why are there no non-avian dinosaurs alive today? The non-avian dinosaur part of the evolutionary tree went extinct about 66 million years ago, likely due to a catastrophic event such as an asteroid impact, leaving no real dinosaurs alive today except for their bird descendants.

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Some dinosaurs ate lizards, turtles, eggs, or early mammals. Some hunted other dinosaurs or scavenged dead animals. Most, however, ate plants (but not grass, which hadn't evolved yet).Rocks that contains dinosaur bones also contain fossil pollen and spores that indicate hundreds to thousands of types of plants existed during the Mesozoic Era. Many of these plants had edible leaves, including evergreen conifers (pine trees, redwoods, and their relatives), ferns, mosses, horsetail rushes, cycads, ginkos, and in the latter part of the dinosaur age flowering (fruiting) plants. Although the exact time of origin for flowering plants is still uncertain, the last of the dinosaurs certainly had fruit available to eat.

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Dinosaurs are a group of reptiles that have lived on Earth for about 245 million years.

In 1842, the English naturalist Sir Richard Owen coined the term Dinosauria, derived from the Greek deinos, meaning “fearfully great,” and sauros, meaning “lizard.”

Dinosaur fossils have been found on all seven continents.

All non-avian dinosaurs went extinct about 66 million years ago.

There are roughly 700 known species of extinct dinosaurs.

Modern birds are a kind of dinosaur because they share a common ancestor with non-avian dinosaurs.

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Paleontologists are like detectives who examine the evidence that extinct animals left behind. Those clues to what dinosaurs were like are found in fossils—the ancient remains of an organism, such as teeth, bone, or shell—or evidence of animal activity, such as footprints and trackways.