THE SMART TRICK OF DOG THAT NOBODY IS DISCUSSING

Birds have acute eyesight—raptors (birds of prey) have vision eight moments sharper than human beings—owing to greater densities of photoreceptors inside the retina (nearly one,000,000 for every square mm in Buteos, in comparison with 200,000 for human beings), a significant number of neurons in the optic nerves, a second set of eye muscles not