Vertebrates can be fish, reptiles, mammals, birds and amphibians. This cockroach is called a hissing cockroach and it's a type of invertebrate. Invertebrates have no backbone. Insects, spiders and ...

The total number of invertebrate species could be 5, 10, or even 30 million, com- pared to just 60,000 vertebrates. One reason for the success of invertebrates is how quickly they reproduce.