Mammals are warm blooded air-breathing vertebrate animals that are categorized by their hair, three middle ear bones and the mother nursing their young ones with milk. Mammals have backbone and spines i. Mammals have hair or fur on their bodies.
Small intestine Large intestine It has an alimentary canal and different accessory glands that help in digestion by secreting digestive fluids. The digestive tract of these creatures has a four-layered wall. The lumen of the digestive tract has a mucus membrane called the mucosa.
The mucosa is followed by a connective tissue layer and a smooth muscle layer. The outermost layer is comprised of connective tissues, being attached to the body cavity membrane.
Excretory System The excretory system in most of the species consists of two kidneys, a renal artery, nephrons and glomeruli. The main function of the kidneys is to filter the blood of all the metabolic waste products and transporting the urine through the uterus to be stored in the urinary bladder.
The urine is then excreted from the bladder. Characteristics of Mammals Modern Mammals have many characteristic features that help to distinguish them from other amniotes and also the amphibians: The presence of body hair is a unique characteristic of Mammals. Animals from no other class have true hair, while all mammals are at least partially covered with hair at some stage in their lives.
For example, dolphins and whales are born with mustaches that fall out as they become adults. The females of all Mammal species have mammary glands that produce milk for nursing the offspring. Mammary glands are actually modified sweat glands, which are also a distinctive feature present in these animals.
This is the typical tooth replacement pattern seen in Mammalians. In this pattern, tooth replacement occurs only once in the entire lifetime of the animals. The juveniles have smaller and weaker teeth compared to the adult teeth.
It is called the deciduous teeth which fall out to be replaced by the stronger and larger permanent teeth as the animals grow up. This refers to the ability to control one's own body temperature and keep it relatively constant regardless of the outside temperature.
All mammals are Endothermic or warm-blooded. Their hearts are distinctively separated into four chambers, 2 atria and 2 ventricles.
This feature helps to distinguish them from reptiles and amphibians. However, birds also have four-chambered hearts. The presence of the neocortex region in the brain is a unique feature of these animals.
The above characteristics help to classify living animals. However, these gland and soft tissue features cannot be used for identifying fossils of prehistoric mammals.
The following anatomical traits are observed for this purpose: A single bone in the lower jaw: Another characteristic feature seen in the Mammalian species is the single bone in their lower jaw which is directly attached to the skull. This bone is known as the dentary as it holds the lower jaw teeth.
Three bones in middle ear: The unique arrangement of three middle ear bones, known as the incus anvilmalleus hammer and stapes stirrup is another important characteristic.
In Mammals, the dentary lower jaw bone holding the teeth and the squamosal a small skull bone converge to form the jaw joint. Unlike most tetrapods, Mammals have two knobs at the skull's base that fit into the uppermost vertebra.
Mammal Habitats Mammals are found in all types of habitats and they can adapt to almost all climatic conditions. They inhabit tropical rainforests, savannas, temperate regions and extremely cold climates. Many species live in underground burrows while others dwell on trees.
Majority of the species live on land and can be found in forests, deserts, grasslands and mountains. Most of the well known Mammals, like lion, tiger, bear and dog are land animals.
There are around different species including whales, seals, walruses and dolphins that live in ocean habitats. But they do not inhabit very deep waters as they need to resurface from the water regularly to get oxygen. Many species are arboreal, meaning they live mainly in trees.
Squirrel, sloth, marmoset and koala are examples of arboreal Mammals.Marine mammals share several characteristics that are common among all mammals such as the need to breathe air, being warm-blooded, having mammary glands which produce milk to feed their young, giving birth to live young (pregnancy/gestation periods) and in some cases having hair.
Winter Fishtival: Marine Mammal Fun Facts Posted on December 29, by Seattle Aquarium Join us for hands-on activities, special talks and opportunities to learn more about the care and feeding of the Aquarium’s fish, birds, tide pool animals and marine mammals during Winter Fishtival! NOEPS: Marine Mammal Adaptations and Climate Change: Grades K-2 Page 2 of 10 3) Whales have a streamlined body shape so that they move through water more efficiently.
4) When it comes to food and how they obtain it, . Marine Mammals What comes to mind when the subject of marine mammals is introduced? Most people probably only think of a few species of dolphins, whales, or seals.
But there are over one hundred species grouped into three orders: cetaceans, sirenians, and carnivores.
What is a Mammal? Warm blooded animals included in the Amniota clade are collectively known as Mammals. Animals in the class Mammal are distinguished from other amniotes like birds, reptiles and amphibians by various physical features including the presence of hair, the neocortex region in their brains and the presence of mammary glands in females.
Marine mammals communicate underwater with sound, and many species use sound (echolocation) to locate prey. Tactile senses are acute. Pinnipeds and fissipeds have well-developed facial whiskers.