Von der Decken's sifaka (Propithecus deckenii) is a sifaka lemur that is endemic to the arid, deciduous and spiny succulent forests of Western Madagascar. It has a length of 92 to 107 centimeters, of which 42-48 centimeters are tail.[1] The species is named in honor of the German explorer Karl Klaus von der Decken.
Its pelage is usually creamy white, with tinges of yellow-gold, silver-grey or pale brown on the neck, shoulders, back and limbs. The face is entirely black.[1] Group size is between two and ten individuals, with groups of three to six being the most common.[1]
The IUCN lists its status as critically endangered, and it is listed in CITES Appendix I.[2]