The evolution of animals is virtually proven, and can therefore be accepted as truth. You can often see this in the camouflage techniques in herbivores and the special claws on the like in carnivores. But with some animals, we can still ask ourselves whether the evolution of that animal is not a bit strange. This can often be seen in the skeleton of the animals.
The skeleton of a pufferfish
We immediately start with one of the strangest fish, the pufferfish. Not only are these fish poisonous, but they also blow themselves up when they feel threatened.
This fish also has bones. Even if you would think at first sight that it is not. His bones mainly consist of a circular spine that is pushed over each other. When the fish inflates itself, the skeleton expands further so that it can grow larger.
The skeleton of a whale
It is also hard to believe with this animal, but whales were once land animals that mainly ate food from rivers. For this they have adapted to hunt better in the water. That's how they evolved into these gigantic mammals that they are today.
Not only the fossils are proof of the period when they were land animals, but also a set of bones that have not yet completely evolved away. This can be compared to a human tailbone. This stems from the time when we still walked around with a tail.
The skeleton of a babiroussa
The male babiroussa have a very special set of teeth. (Teeth also belong to the skeleton)
Not only the lower canines grow from their mouths, but also the upper ones. These top teeth don't grow down as you might expect, but they also grow up, right through its snout. As with rodents, these teeth continue to grow throughout its life.
The reason they grow through its snout is unknown. They are too brittle to fight and break easily. But if they don't break off, there is a chance that his teeth will grow right through his skull and penetrate the brain.
The skeleton of humans.
We, the people, also belong on this list. Because humans can walk upright, our bodies have actually deteriorated in a number of ways. Due to the fact that we walk upright, our body has adapted. This results in 80% more back complaints. But the hips have also been adapted during evolution to make walking upright possible. The hips in turn cause problems at birth. Outside of humans, there is no animal where a baby's head is so large in relation to the hips of an adult female.
This used to lead to a huge number of miscarriages, but since modern medicine, caesarean section and ultrasounds, this death toll has dropped significantly.
The skeleton of a penguin
The penguin is also on this list. It is often forgotten that a penguin actually has knees. To make it possible for the penguin to hold the eggs between their legs, a penguin's knees are made so that they always crouch.
Imagine how uncomfortable it would be for us to walk around crouched day in and day out ...