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Didelphimorphia

marsupial order

Quick Summary

Didelphimorphia is an order of New World marsupials that includes opossums. These mammals are characterized by premature birth, with their young continuing to develop in a pouch. The order comprises over 100 species within the family Didelphidae.12

Species within Didelphimorphia vary in size, from mouse-sized to that of a house cat. They are found throughout Central and South America, with the Virginia opossum (Didelphis virginiana) being the only species native to North America north of Mexico.1

Many opossums are omnivorous, consuming insects, small animals, fruits, and plants. Some species have unique adaptations, such as the Virginia opossum's ability to feign death ("playing possum") and a blood protein that neutralizes various poisons. Some short-tailed opossums lack a pouch, and some species are semelparous, reproducing only once in their lifetime.13

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