Golden lion tamarin (Leontopithecus rosalia). Photo © Su Neko

Golden lion tamarin (Leontopithecus rosalia). Photo © Steve Washington
There is a psychological rather than a zoological reason why no species or subspecies of mammal is called ‘orange’: this term is subconsciously considered too demeaning even for a monkey.
An example is the golden lion tamarin, shown here for comparison with a butterfly of similar hue, namely the orange albatross.
Robin and the Honey Badger, 8 January 2017

Orange albatross (Appias nero). Photo in the Public Domain
