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  2. Mammals | Definition, Characteristics & Examples - Lesson -...

    study.com/academy/lesson/mammals-traits-behavior-grouping.html

    Aside from this, mammals evolved to have relatively larger brains than birds and reptiles, which correlates to their increased intelligence. Fun facts!: Dolphins and Whales are, in fact, mammals!

  3. Animal Respiratory System | Birds, Amphibians & Mammals

    study.com/academy/lesson/amphibian-bird-mammal-respiratory...

    Birds have nares while mammals have nostrils. Birds have air sacs located in front of and behind the lungs, while mammals have air sacs within the lungs. Birds inhale and exhale twice for every ...

  4. Birds | Characteristics, Features & Importance - Lesson -...

    study.com/academy/lesson/birds-traits-types-importance.html

    Birds' body temperature is higher than other mammals, about 104°F or 40°C, which allows their muscles to work about 2.2 times faster. The shape and arrangement of the feathers are what allows ...

  5. Are ducks mammals or amphibians? | Homework.Study.com

    homework.study.com/explanation/are-ducks-mammals-or...

    Answer and Explanation: 1. Ducks are neither mammals nor amphibians. They are birds. All birds belong to the taxonomic class Aves. Ducks are classified into the taxonomic...

  6. Warm-Blooded Animals | Definition, Mechanisms & Examples

    study.com/academy/lesson/warm-blooded-animals-definition...

    Since birds and mammals are the most recent class of animals, this means that warm-bloodedness is a relatively young adaptation that probably occurred when these animals were evolving.

  7. Amniotes | Definition & Examples - Lesson - Study.com

    study.com/academy/lesson/amniotes-definition-and...

    Birds come as small as hummingbirds and as large as ostriches and are found on all seven continents, making them one of the most diverse groups of animals on Earth. Like birds, mammals are also ...

  8. Oviparous Animals | Definition, List & Examples - Lesson -...

    study.com/academy/lesson/oviparous-animals-definition-list...

    The number of animals who reproduce in this way is long, and includes fish, mammals, reptiles, amphibians, birds, and arthropods. Different species have different ways of both laying their eggs ...

  9. Closed Circulatory System | Definition, Types & Examples

    study.com/academy/lesson/animals-with-closed-circulatory...

    Mammals and birds have four-chambered hearts that separate oxygenated blood from deoxygenated blood, while amphibians and most reptiles have three-chambered hearts with two atria and a single ...

  10. Mammals vs Reptiles | Characteristics & Differences - Lesson -...

    study.com/learn/lesson/mammals-vs-reptiles-similarities...

    Reptiles are not mammals. Mammals are covered in fur or hair, produce milk for their young, and are endothermic. Reptiles are covered in scales, produce eggs, and are ectothermic. Is a bird a ...

  11. What do amphibians, reptiles, birds and mammals have in common?

    homework.study.com/explanation/what-do-amphibians-reptiles...

    What do mammals, reptiles, birds, amphibians and fish eat? What are the similarities between mammals and amphibians? Which vertebrates are endothermic: birds, reptiles, amphibians, mammals or bony fish? Which are the most abundant and diverse of the extant vertebrates a.) bony fish b.) avian reptiles c.) amphibians d.) non-avian reptiles e ...