The adult human skeleton consists of 206 bones.

A typical mammalian heart has 4 chambers: two atria and two ventricles.

Humans have 23 pairs of chromosomes, totaling 46.

There are approximately 5500 recognized species of mammals.

There are 5 main classes of vertebrates: mammals, birds, reptiles, amphibians, and fish.

The average lifespan of a red blood cell in humans is about 120 days.

An adult human typically has 32 teeth, including wisdom teeth.

As of now, there are approximately 30 recognized animal phyla.

A female frog can produce around 5000 eggs in a single spawning.

Approximately 90% of all animal species are invertebrates.