A couple of things about this. Suryia was specifically trained to swim, and both animals were given many opportunities to become used to deep water. Ropes strung across the deep end of a pool gave Cooper a safe way to full submerge himself without risking drowning. Finally, it’s only a sample size of two. In other words, these behaviors probably don’t say much if anything about inherent or wild primate behaviors or abilities.
A. Suryia swimming, view from above. The most characteristic elements are the high range of limb movements, especially from the hind limbs, and the lateral component of hind and front limbs.
B. Suryia swimming, view from the side. The action of the hands and feet during the stroke is shown. Suryia keeps his eyes open under water.