If we look across the whole of the mammal branch of the tree of life, we find there are many groups of mammals that have evolved testicles of all different sizes. In almost all these separate cases, ...

We humans, for example, were animals before we became vertebrates; mammals before evolving into primates and so on. The groups of species we share each of these branches with reveal the order our ...

Fish: Vertebrates that live in water and breathe using gills; Fish are defined as vertebrates (meaning they have a backbone) that live in water and use gills to breathe.

This major evolution was enabled by the emergence of anatomical innovations, such as limbs and the cervical region, specific to tetrapods (four-limbed vertebrates). The neck, absent in fish, allows ...

Animals with a backbone may have first emitted something akin to bleeps, grunts, crackles, toots and snorts more than 400 million years ago ...

Learn about vertebrates with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.

We humans, for example, were animals before we became vertebrates; mammals before evolving into primates and so on. The groups of species we share each of these branches with reveal the order our ...

The groups of species we share each of these branches with reveal the order our body parts appeared. ADVERTISEMENT A body and a gut (inventions of the animal branch) must have come before backbone and ...

The groups of species we share each of these branches with reveal the order our body parts appeared. ADVERTISEMENT A body and a gut (inventions of the animal branch) must have come before backbone and ...