Callosciurus

Callosciurus is a genus of tree squirrels native to South and Southeast Asia. Its members are commonly called beautiful squirrels and include species with varied coat colors and patterns.

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Callosciurus erythraeus: Pallas's squirrel is a widespread Callosciurus species with many regional forms and introduced populations. It is one of the genus's best-known and most widely distributed members.
Pallas's squirrel in Europe: Introduced populations of Pallas's squirrel occur in parts of Europe, where the species is non-native. These populations show how a Callosciurus species can become an ecological concern beyond its native range.
Dremomys: Dremomys is a genus of Asian tree squirrels found from the Himalayas to Southeast Asia. It is another Asian arboreal squirrel genus with overlapping parts of Callosciurus's range.
Bornean black-banded squirrel: The Bornean black-banded squirrel is a Callosciurus species endemic to Borneo. Its restricted island range contrasts with the broad distributions of some congeners.
Callosciurus prevostii: Prevost's squirrel is a Southeast Asian tree squirrel known for its sharply contrasting black, white, and chestnut markings. Its striking coloration illustrates the pattern diversity behind the common name beautiful squirrels.
Invasive species: An invasive species is a non-native organism that spreads and causes ecological, economic, or human harm. Introduced Pallas's squirrels are assessed through this framework in regions where they spread.
Tamiops: Tamiops is a genus of small Asian striped squirrels, including species that live in trees and on the ground. Its members are familiar regional squirrel counterparts, but belong to a separate genus.
Berdmore's squirrel: Berdmore's squirrel is a Southeast Asian tree squirrel in the genus Callosciurus. It represents a less familiar species within the genus's mainland diversity.
Callosciurus finlaysonii: Finlayson's squirrel is a variable Southeast Asian species with numerous color forms. Its color variation is unusually conspicuous even within this visually diverse genus.
Island biogeography: Island biogeography studies how island area, isolation, and ecological conditions shape species richness and distribution. Southeast Asian islands and peninsulas help structure the genus's distributions and isolated populations.