animal bed forest javanicus leaf leafs lesser life malayan mammal Mousedeer Nyberg Tragulus wild .orange-buff canines chevrotain colored colorful colors coloured colourful colours deer delicate distinctive elongated-upper-jaw-canines even-toed-ungulate fur greater-Malay-chevrotain greater-mouse-deer herbivore herbivorous hooves large-eyed miniature mouse-deer napu nocturnal Singapore-zoo small solitary terrestrial territorial tiny tragulus-napu triangular-head trusting wet-swampy-habitat zoo