Dolphins are well known for their intellect, their gregarious nature, and their acrobatic abilities. But there are many lesser known qualities that make a dolphin a dolphin.
When light passes from air to water, it changes speed. The creates an optical effect referred to as refraction. For dolphins, this means their eyes must correct for these differences if they are to see clearly in both conditions. Fortunately, dolphins have specially adapted lens and cornea that enable them to see clearly in and out of the water.
Dolphins, like all toothed whales, lack olfactory lobes and nerves. Because dolphins do not possess these anatomical features, they most likely have a poorly developed sense of smell.
Dolphins can recognize their old friends even after 20 years of being apart.
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