Good question. People like to put things into
categories to keep things organized. The living
world doesn’t always fit neatly into those
categories. Development of babies into adults is a
good example of trying to make categories.
Think about a baby horse, cat, or dog. If you
saw a picture of one, you could tell that it was a
foal, kitten, or puppy, even if you didn’t know
how big it was. Their heads are big compared to
their bodies. Their eyes are big for their heads.
They have higher foreheads and smaller noses.
But these are not huge differences. Basically,
mammals just get bigger as they develop. Their
proportions—the size of one part compared to
another—change. But they do not add whole new
People wanted a different word for extreme
changes, like a caterpillar into a butterfly, or a
maggot into a fly. This is called complete
metamorphosis. A crawling thing with a big
body and many small legs becomes a flying thing
with 6 long legs. The animal’s entire body is
Some things are in between. For example,
crickets and beetles start off without wings.
They look different from their parents in other
ways, but those differences are not huge, like a
caterpillar turning into a butterfly. This is
called incomplete metamorphosis.
The only mammals that fly are bats. Do you think
baby bats have wings?
If you are interested in questions like this,
you may want to study biology.
Thanks for asking,