1) Pen-tail 2) Pen-tailed tree shrew 3) Tree shrew 
• (n.) A peculiar insectivore (Ptilocercus Lowii) of Borneo; -- so called from its very long, quill-shaped tail, which is scaly at the base and plumose at the tip.
Pen'tail` noun (Zoology) A peculiar insectivore ( Ptilocercus Lowii ) of Borneo; -- so called from its very long, quill-shaped tail, which is scaly at the base and plumose at the tip. 
[n] - brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third
pen-tail noun brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia