Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns.Click to see full answer. Thereof, what percentage of animals on earth are vertebrates? Answer and Explanation: Less than five percent of the animals on earth are vertebrates. They include mammals, amphibians, reptiles, fish and birds. Insects and other invertebrates far outnumber vertebrates.Similarly, how many species of vertebrates are there? There are approximately 40,000 species of vertebrates in the world, 484 of them have been found in Estonia. The distribution of Estonian vertebrates is following: fishes – 75 species, amphibians – 11 species, reptiles – 5 species, birds – 328 and mammals – 65 species. Moreover, what percent of chordates are vertebrates? Of the approximately 50,000 living chordates, 97% are vertebrates —animals whose skeletons include a backbone. Three features are present in all chordates. These include a stiffening rod, called a notochord that in many members (e.g., the vertebrates) is replaced during development by a bony, vertebral column.Are the majority of animals vertebrates or invertebrates?Altogether, invertebrates make up at least 95 percent of all animal species. Vertebrates are animals that have a backbone. All vertebrates belong to the phylum Chordata. They include fish, amphibians, reptiles, birds, and mammals.