Scientists use classification to divide the animal kingdom and make them easier to study and understand based on their similarities.

As far as classification is concerned, animals must share more than one quality to be in the same group, otherwise all animals with wings would be birds even if they were insects.

I have a different classification for everyone I know, as I break them down into groups based on whether or not they are my friends, acquaintances, or outright enemies.

You are probably familiar with the main classification of the animal kingdom’s branches, which includes mammals, reptiles, amphibians, and birds.

When it comes to animal classification, scientists look for particular traits typically unique to each class, such as gills, being cold-blooded, or breast feeding infants.