Weddell's saddle-back tamarin

Weddell's saddle-back tamarin (Leontocebus weddelli) is a species of saddle-back tamarin, a type of small monkey from South America. Weddell's saddle-back tamarin was formerly considered to be a subspecies of the brown-mantled tamarin, L. fuscicollis. It lives in Brazil, Bolivia and Peru, with the type locality being in Bolivia.

There are 3 subspecies:
 * Leontocebus weddelli weddelli
 * Crandall's saddle-back tamarin, (Leontocebus weddelli crandalli)
 * White-mantled tamarin or White saddle-back tamarin, (Leontocebus weddelli melanoleucus)

Males have a head and body length of about 190.0 mm and females have a head and body length of about 196.6 mm. The tail is between 250 mm and 300 mm long. Males weigh about 359 g and females weight about 357 g.

Its diet consists of fruits, gums, nectar, insects and other small animals. It lives in various types of groups, including single-adult male, single adult female groups, multi-male, multi-female groups, single-male, multi-female groups and single female, multi male groups. Females sometimes remain in their natal group. It associates with the emperor tamarin, the red-bellied tamarin and Goeldi's marmoset.

The IUCN rates it as least concern from a conservation standpoint.