Animals : Invertebrates

These smaller animals make up most of the animals on the planet! Unlike the vertebrates, invertebrates have no “notochord”; They do not have an internal skeleton, but have an external skeleton which is a bit like a suit of armour. This difference may seem minor – but there is such a range of invertebrates from spiders to octopus and starfish to beetles, that there is much more variation within invertebrates than between the invertebrates and vertebrates!