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A small, lens-shaped radial sesamoid embedded into the APL tendon is a primitive state found in all known Carnivora genera except in the red and giant pandas and the extinct Simocyon where it is hypertrophied (enlarged) into a sixth digit or a so called "false thumb", a derived trait that first appeared in ursids.
As part of conservation programs, the Utica Zoo has housed Mexican Wolves, Red Pandas, White-naped Cranes, White-handed Gibbons, Mexican Spider Monkeys, Golden Lion Tamarins, Golden-headed Lion Tamarins, California Sea Lions, Prehensile-tailed Skinks, Collard Peccaries and Snowy Owls.