Every creature on this planet brings down a particular electromagnetic wave on the Earth. And even if one creature goes missing, the Earth would not be able to sustain itself. There is snake, mouse, lion, cow, cat, fish and so many others, and all play an important role in maintaining the balance on the planet. That is what scientists say today.
According to the laws of nature, everything radiates energy.
In the middle ages, people never understood that butterflies have very specific things to do. If there are no butterflies, food cannot be grown. People with less knowledge question what butterflies have to do with having more food.
In the US, when the pesticides were spread, they never considered butterflies or insects as an important phenomenon.
So what happened? All the butterflies disappeared! Now they are bringing butterflies in containers and leaving them in the fields so that pollination can happen and food can be grown. The quality of food suffers a lot when pollination does not happen.
So, from an ant to an elephant, everything has a role to play in this planet.