Sylvain Cordier / Lesser mouse-deer (Tragulus kanchil) Sabah, Borneo.

Roland Seitre / Java mouse-deer (Tragulus javanicus) at night, occurs in Java.

Roland Seitre / Java mouse-deer (Tragulus javanicus) captive, occurs in Java.

Roland Seitre / Java mouse-deer (Tragulus javanicus) captive, occurs in Java.

Roland Seitre / Java mouse-deer (Tragulus javanicus) with 'tapetum lucidum' in eyes reflecting light, captive, occurs in Java.

Roland Seitre / Lesser mouse-deer (Tragulus kanchil) captive, occurs in Southeast Asia.

Daniel Heuclin / Lesser mouse deer (Tragulus kanchil), Malaysia, February.

Hanne & Jens Eriksen / Lesser mousedeer (Tragulus kanchil) drinking, Thailand, February

Hanne & Jens Eriksen / Lesser mousedeer (Tragulus kanchil) at water, Thailand, February

Hanne & Jens Eriksen / Lesser mousedeer (Tragulus kanchil) Thailand, February

Chien Lee / Kanchil (Tragulus kanchil), one of the world's smallest ungulates, Bintulu, Bukit Sarang Conservation Area, Sarawak, Borneo, Malaysia

Roland Seitre / Kanchil (Tragulus kanchil), Singapore Zoo, Singapore

Joel Sartore / Photo Ark / Bornean Lesser mouse deer (Tragulus kanchil klossi) male standing and looking around, Singapore Zoo. Captive.

Joel Sartore / Photo Ark / Bornean lesser mouse deer (Tragulus kanchil klossi) male grooming itself, Singapore Zoo. Captive.