Why do insects have such short lives? Many insects seem to have short lives because they have evolved to prioritize rapid reproduction over a long life. However, it only seems that way if we focus on certain kinds of insects, or if we only look at their adult stage. Not all insects have short lives. […]
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Why don’t we notice when we blink? We don’t notice when we blink because our brain suppresses its visual center and makes sure our eyes are pointing in the same direction. Everybody is different, and we all blink a different number of times depending on the time of day, the condition of our eyes, the
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Why do cats’ eyes glow in the dark? A cat’s eyes glow in the dark because they have a special reflective layer in their eyes called a tapetum lucidum. Cats aren’t the only animals whose eyes glow at night. The reason for this comes down to the way that we see and why we can’t
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Why do living things stop growing? Not all living things stop growing, but those that do stop for a number of different reasons. Mammals, birds, fish, reptiles, insects, and plants all follow different growth programs, and those programs reflect different body plans and different trade-offs. Not all living organisms stop growing. Plants and fungi often
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Why does an octopus have three hearts? An octopus has three hearts because getting oxygen from gills is hard work, and its copper-based blood does not carry oxygen as efficiently as human blood. Using three pumps keeps oxygen moving through the gills and around the body. The job of a heart is to keep blood
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Can birds sleep while they fly? Not all species can, but there are some birds that can sleep while they are flying. Most birds land to sleep. They perch on branches or buildings, balanced so well that they can stand on two legs without toppling over. Many species also have tendons that lock their feet
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Do all animals have imprinting? No, not all animals have imprinting, but a lot do. Imprinting is where a newborn animal learns to follow its protector as soon as it is born. When the animal is born, it imprints the closest animal, usually its mother, into its brain and then follows that animal exclusively. The
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How do fish ladders work? Fish ladders have a series of stepped pools that allow fish to swim back up a river and climb over any human-built obstacles that might be in their way. The idea is to mimic the natural riverbed. Salmon are the most commonly known, but there are many different kinds of
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How do ants farm aphids? Ants farm aphids by herding them together, feeding them, and keeping them out of the sight of predators. Aphids are small insects that suck the sap out of plants. They are usually between one and three millimeters long, and they have specialized mouth parts for cutting into plants and drinking
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Why do zebras have stripes? Nobody knows the actual reason, but the main theory is that they deter biting flies. Other theories are that they could also be for camouflage or thermoregulation. There doesn’t have to be one single reason, and it could easily be a combination of all of these. There are three different
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