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Birds and Mammals Share Which Characteristic? (Answered)

Written by Clinton Atkins / Fact Checked by George Dukes

birds and mammals share which characteristic

The answer to what birds and mammals share which characteristic is being warm-blooded and vertebrates. These are only the primary things these two species have in common.

Let’s learn about these similar attributes and discover interesting facts about birds and mammals. You’ll find yourself with more fun knowledge about nature.

Birds and Mammal Share Which Of The Following Characteristics


What similar features come to your mind when asked about this? Is it pigmented skin? The pneumatic bones? Giving birth? Or homeothermy?

You probably read a questionnaire that gives you these options to choose from. Do you know the answer? If not, we will give it to you and explain the topic further.

Avians do not have pigmented skin and only lay eggs. Furthermore, pneumatic bones are unique to birds for their flight adaptation. The obvious answer is homeothermy or being warm-blooded.

Birds and mammals are both warm-blooded (homeothermic). Homeothermy is the ability to maintain an internal body temperature within a certain range, despite external conditions. Warm-blooded animals or homeotherms regulate their metabolic process to maintain their body temperature.

In a comparison of birds and mammals, there are other similarities shared between these two, with a slight difference at a closer look.


  • Vertebrates– both have backbones. Birds have hollow bones that aid in their flight.
  • Four-Chambered Heart– the heart structure of both species has four chambers. Birds evolved into having the four-chambered heart to assist in their energy-consuming flight.
  • Breathing Through Lungs– while both breathe air with their lungs, birds have a more complex respiratory system, making it more efficient than mammals

Frequently Asked Questions

How do birds and mammals share common ancestry?

Birds’ and mammals’ common ancestry can be traced back over 310 million years in the past. Studies showed that there are placode, small tissue bumps on the surface of a growing embryo, in birds and mammals.

Scientists deduced that birds and mammals, as well as reptiles, became the heir of this placode from a single ancient reptilian ancestor believed to have an outer layer of scale structure.

What characteristics do all birds share?


There are a wide variety of birds that differ in size, shape, and color, but they share some characteristics that make them a bird.

  • Warm-blooded
  • Feathers
  • Wings
  • Lays eggs
  • Spine

What are some characteristics that mammals share?


Mammals are a diverse species, and there are many animals that fall into this category. Here are some distinct characteristics of mammals.

  • Hair/Fur
  • Mammary Glands
  • Warm-blooded
  • Diaphragm
  • Single-Boned Lower Jaws
  • Three Inner Ear Bones
  • Diphyodont
  • Four-Chambered Hearts
  • More Complex Brain

Is a Bird a Mammal?

No. Despite sharing some characteristics and common ancestry, a bird can never be a mammal. They still have more distinct differences that set them apart. This includes physical appearance, movement, and reproductive systems.


Birds and mammals share which characteristic? Whenever you encounter this question and are presented with several options, you’ll know which one to choose and get the correct answer. All the additional information about this topic is also useful in strengthening your case or sharing some facts with your family and friends.

We hope you found this article helpful and that it served the purpose of enlightening you about what birds and mammals have in common. If you have anything to share with us, don’t hesitate to comment below! We read them!

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Clinton Atkins


Hi, I'm Clinton. Rocky and I became friends after a birdwatching trip with our new group. And we have been enjoying every adventure together. When he told me the idea of establishing a site that shares our experiences and fun, I immediately agreed. After trials and errors, here we have Thayerbirding.

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