Finlayson's Squirrel (Callosciurus finlaysonii) lives in tropical rainforest across Southeast Asia. It feeds on fruits and seeds. Its conservation status is Least Concern.
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Finlayson's squirrel shows an extraordinary range of fur colours, with each subspecies often distinguished by its palette. Some are overall whitish, others blackish with white tail-tips, while others display rufous, reddish-brown or olive-brown upperparts. Even within a single subspecies individuals may differ, and unnamed populations such as a shiny-black group in central Laos with a red tail exist.
Scientists currently recognise sixteen distinct subspecies of Finlayson's squirrel across its Southeast Asian range. Each of these forms is typically identified by its unique fur pattern, from the whitish nominate to the reddish-brown C. ferrugineus and the grizzled C. The subspecies names often honour individuals, such as C. boonsongi named after Thai zoologist Boonsong Lekagul.
The subspecies C. bocourti has been introduced beyond its native range, establishing populations in Singapore and two regions of Italy, likely because it is popular in the pet trade. It has also spread to the Philippines, where sightings in Metro Manila and surrounding provinces confirm its invasive status. The European Union now lists the species as an invasive alien of Union concern, banning its import, breeding and release.
Finlayson's squirrel is listed in the European Union as an invasive alien species of Union concern because its introduction has caused significant ecological damage. The EU regulation therefore bars any member state from bringing the animal into the market, keeping it in captivity, moving it across borders, selling it or releasing it deliberately into the wild.
A genetic analysis of twelve Thai subspecies of Finlayson's squirrel showed they fall into six distinct genetic clades. The study sampled seven mainland subspecies and five island subspecies, and many of the clades are separated by large rivers on the mainland or by the sea around the islands, acting as natural barriers that shape their genetic structure. These water boundaries help maintain the diversity observed across the region.
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In the lush canopies of Southeast Asia, the Finlayson's squirrel dances with effortless agility, its slender form weaving through the dense foliage with a mesmerizing fluidity. As it moves, the warm sunlight catches its rusty-red fur, illuminating the vibrant hues that seem to shimmer and glow in the dappled light, a true marvel of nature's artistry. With its large, round eyes shining bright with curiosity, this charismatic creature embodies the very essence of the forest, its every leap and bound a testament to the unbridled joy of being alive.
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