placental mammal

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Images & Videos

An adult capybara (Hydrochoerus hydrochaeris) stands in shallow water beside two young capybaras, all with brown fur and rounded bodies.

A pangolin walks through grass with a blue circle around it and the word endangered written in white across the image.

A simplified phylogenetic tree diagram showing the evolutionary relationships among major mammal groups, including Tritylodontidae, Morganucodon, Triconodon, Monotremata, Metatheria (marsupials), and Eutheria (placentals), with Mammaliaformes and Mammalia as ancestral branches and living mammals indicated at the top.

parallel evolution of marsupial and placental mammals

Diagram of the tree of life based on the three-domain system, showing Archaea, Bacteria, and Eukaryota branching into four kingdoms: Plants, Animals, Fungi, and Protista, with illustrations of representative organisms for each group.

placental mammal: Media

animal

Videos

A pangolin walks through grass with a blue circle around it and the word endangered written in white across the image.

Meet the Endangered Pangolin

The pangolin is the only mammal in the world covered in scales.

Video: Encyclopædia Britannica, Inc.

Images

An adult capybara (Hydrochoerus hydrochaeris) stands in shallow water beside two young capybaras, all with brown fur and rounded bodies.

Capybara

Adult capybara (Hydrochoerus hydrochaeris) with her young.

© Stephen Meese/stock.adobe.com

A simplified phylogenetic tree diagram showing the evolutionary relationships among major mammal groups, including Tritylodontidae, Morganucodon, Triconodon, Monotremata, Metatheria (marsupials), and Eutheria (placentals), with Mammaliaformes and Mammalia as ancestral branches and living mammals indicated at the top.

mammal phylogeny

Mammal phylogeny.

Encyclopædia Britannica, Inc.

parallel evolution of marsupial and placental mammals

parallel evolution of marsupial and placental mammals

Parallel evolution of marsupial mammals in Australia and placental mammals on other...

Encyclopædia Britannica, Inc.

Diagram of the tree of life based on the three-domain system, showing Archaea, Bacteria, and Eukaryota branching into four kingdoms: Plants, Animals, Fungi, and Protista, with illustrations of representative organisms for each group.

The three-domain classification of life-forms

The tree of life according to the three-domain system of biological classification,...

Encyclopædia Britannica, Inc.

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