Continuity with our species does not provide any protection at all. This is because the evolutionary process cannot confer any value on humans — or any other species.
He thinks we are just a collection of carbon molecules and certainly of no intrinsic value simply and merely because we are human.
A biologist and lifelong pet owner recounts personal experiences with a long-tailed macaque.
What is the nature, and extent, of animal intelligence?
These biological facts are often misused to try to push us beyond our welfare duties and into according animals human-type rights.