The brain of a mammal is relatively large and has a covering called the neocortex. This structure plays an important role in many complex brain functions. The mammalian middle ear has three tiny bones that carry sound vibrations from the outer to inner ear. The bones give mammals exceptionally good hearing. In other vertebrates, the three bones are part of the jaw and not involved in hearing.
Mammals have four different types of teeth. The teeth of other vertebrates, in contrast, are all alike. Dolphins are mammals that have adapted to swimming and reproducing in water. Summary Mammals are a class of endothermic vertebrates.
Mammals have four limbs and produce amniotic eggs. There is one other common characteristic shared by nearly all mammals with just a few exceptions: nearly all mammals give birth to live young.
The exceptions to this rule are monotremes, such as the echidna and platypus , which lay eggs instead of giving birth to live young. Join us tomorrow for a bright yellow Wonder of the Day that goes great with ketchup and is a perennial picnic favorite. Want to learn eve more about mammals? Check out the following activities with a friend or family member:. Hi, Will! One of the traits that all mammals have is that they all have hair of some sort, so yes! How about this Wonder? That is a great question!
Which animal is the cutest is very subjective and answers would vary. The smallest animal, though might be one you could find an answer to. Good question! They are very hairy to keep themselves warm. Along time ago we were also mammals and we were very hairy because we did not have a clothes to wair. Did that answer your question? Good question, M. You can submit that to our Wonder Bank. You can also check out these Wonders about hair. That's a good question, Avalon!
Narwhals are mammals that belong to the same superfamily as dolphins and porpoises. Check out Wonder for more facts about them! Hi, michael! Dolphins are great animals.
Hi, Kay! We love learning about dolphins. We encourage you to check out these Wonders about dolphins. Hello, jazmyn! That's very true.
Female mammals have mammary glands that produce milk to feed their young. Thanks for reading the Wonder so closely and sharing what you learned in this Wonder! Welcome, Kyra! Thanks for reading so closely and noticing the beginning includes a joke.
Maybe you can start one of your writing pieces the same way. We're glad the joke helped you make connections to the article and understand it better. Thanks for commenting! Be sure to check back to see if your prediction for the next Wonder is correct!
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What is the most interesting thing you learned? Like all vertebrates, mammals have muscular hearts that contract repeatedly to pump blood, which in turn, delivers oxygen and nutrients throughout the body while removing waste products such as carbon dioxide.
However, only mammals and birds possess four-chambered hearts, which are more efficient than the two-chambered hearts of fish or the three-chambered hearts of amphibians and reptiles. A four-chambered heart separates oxygenated blood coming from the lungs from the partially deoxygenated blood that heading back to the lungs to be re-oxygenated.
This ensures that mammalian tissues only receive oxygen-rich blood, allowing for more sustained physical activity with fewer intervals of rest. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content.
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Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Mammals got their name from this evolutionary adaptation. Mammary glands are only found on mammalian species, and no other species. Mammary glands evolved from modified sweat glands to produce milk for offspring.
Only female mammals produce milk, an adaptation that requires an investment of time and energy to care for the newborn offspring. Hair on mammals is an adaptation that provides insulation to keep the animal warm, provide protection to the animal's skin, provides camouflage through color patterns and helps the animal by providing greater sensory input through touch.
All mammals have three middle ear bones, commonly called the hammer, anvil and stirrup. Their scientific names are malleus, incus and stapes.
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