Some breeds of dogs are sighthounds and use their eyes to follow prey. Eyesight in general is not one of a dog’s stronger senses. Dogs have what is known as dichromatic vision. Besides shades of grey and black and white, they see two primary colors – yellow and blue. Old television sets were analog and […]
You can usually tell when a human or an animal is asleep by their closed eyelids. But snakes don’t have eyelids and can’t blink, making it very difficult to determine when they are asleep. Most species of snakes are nocturnal and hunt at night. They sleep during the day for an average of 10 hours. […]
