The five main groups of vertebrates, known as classes, are: fish, amphibians, reptiles, birds and mammals. Vertebrate species are assigned groups based on shared traits, such as body covering, the ability to maintain a steady temperature and the number of chambers in the heart, among others. Some groups of birds and mammals, called clades, are grouped according to a shared ancestry.Know More
Fish are the largest and most diverse group of vertebrates. Fish are the oldest of the vertebrate classes, breathe through gills, and both live in and lay eggs in the water. Fish are ectothermic, and vary their body temperature to match the surrounding environment.
Amphibians are also ectothermic and, like fish, lay their eggs in water. Larval amphibians have gills, but the adult stages of almost every species breathes air through lungs. Amphibians have moist, permeable skin that cannot be allowed to dry out.
Reptiles are ectothermic, air-breathing vertebrates that breed on land. Their skin is usually scaly, and different groups of reptiles either lay a water-resistant egg or give birth to live young.
Mammals are derived from ancestral synapsid reptiles. They maintain a high body temperature, generally give birth to live young and are usually covered with hair. Birds are descended from a different line of reptiles, lay eggs and are covered with feathers. Birds are also capable of maintaining a constant temperature.Learn more about Mammals
According to OneKind, the top five fastest animals are the peregrine falcon, the spine-tailed swift, the frigate bird, the spur-winged goose and the sailfish. While these animals move with extraordinary speed through air and water, the top five fastest animals on land, according to TheTravelAlmanac.com, are the cheetah, the pronghorn antelope, the lion, the Thompson's gazelle and the wildebeest.Full Answer >
The male molly is more slender and has a gonopodium, a modified anal fin functioning as a reproductive organ, while the female is longer and rounder in size. The female Poecilia sphenops, commonly known as a molly, is generally about 4.8 inches and the male is 3.2 inches in length.Full Answer >
Whales are classified as mammals and not as fish because they give birth to live young. They also have a sparse amount of fur on their bodies, they have lungs that breathe air and they give milk to their young.Full Answer >
Beavers do not eat fish. They are vegetarians and eat plant food found near rivers, streams, marshes and lakes. They eat the leaves, twigs and bark from trees. Aspen, birch and willow trees are favorite foods for beavers.Full Answer >