Mammals vs Amphibians
A mammal and an amphibian could never be confused, unless the person has not heard about any of these animals ever. Finally, it does not matter for the death whether it was a mammal or an amphibian, but it matters for the life. The way of life of mammals is much different from that of an amphibian. However, among too many factors, this article intends to discuss the most important differences between a mammal and an amphibian.
Mammals (Class: Mammalia) are one of the warm-blooded vertebrates other than the birds. They are the most developed and evolved animals and the Class: Mammalia includes more than 4250 extant species. It is a small number compared to the total number of species in the world, which is around 30 million as of many of the estimations. However, these small-numbered mammals have conquered the whole world with dominance, with great adaptations according to the ever-changing Earth. One characteristic about mammals is the presence of hair all over the skin of the body. The most discussed and most interesting feature is the milk-producing mammary glands of females to nourish the newborns. However, males also possess mammary glands, which are not functional and do not produce milk. During the gestation period, the placental mammals possess a placenta, which nourishes the foetal stages. Mammals have a closed circularity system with a sophisticated four-chambered heart. Except in bats, the internal skeleton system is heavy and strong to provide muscle attaching surfaces and a firm stature for the whole body. The presence of sweat glands over the body is another unique mammalian feature that separates them from all other animal groups. Pharynx is the organ that produces vocal sounds in the mammals.
Amphibians evolved from fish before 400 million years from today. Presently, there are over 6,500 species living on the Earth, and they have been distributed through all the continents including the unique Australia. Amphibians can inhabit both aquatic and terrestrial ecosystems, but most of them go to water to mate and lay their eggs. Usually, the amphibian hatchlings start their lives in water and migrate to land if it is a terrestrial species. That means at least one stage of their life cycle is spent in the water. During their aquatic life as a larva or tadpole, amphibians take the appearance of small fishes. The tadpoles undergo the process of metamorphosis from larvae into adults. Amphibians have lungs for air breathing in addition to their skin, oral cavity, and/or gills. Amphibians are of three body forms; Anurans have a typical frog-like body (Frogs and Toads); Caudates have a tail (Salamanders and Newts), and Gymnophions have no limbs (Caecilians). Therefore, except for caecilians all other amphibians are tetrapods. Neither they do have scales nor hairs on their skins, but it is a moistened cover enabling gas exchange. Usually, amphibians are rarely found in a desert climate, but very common in damp and wet environments. In addition, they inhabit freshwaters than saltwater environments. Since they are extremely sensitive for environmental changes, amphibians are important as bio indicators. However, the environmental pollution usually affects amphibians more than other life forms.
What is the difference between Mammals and Amphibians?
• Mammals were the last major group of animals to evolve for the terrestrial conditions, whereas amphibians were the first vertebrate group to take the challenge of living out of water.
• Mammals are warm-blooded, but amphibians are cold-blooded.
• Mammals have hairs on skin, whereas amphibians have a bare and moistened skin.
• Mammals have mammary glands to feed the young but amphibian newborns are not breast-fed.
• Mammals show a very high parental care for the offspring, but it is low among amphibians.
• Mammals reach large body sizes, and sometimes those could be exceptionally large. However, amphibians are much smaller than mammals.
• Mammals have conquered most of the Earth while the majority of amphibians are restricted to wet and damp environments because of the high demand of water.