Question

Which of the following is true for birds and not for mammals?

• A. Warm-blooded
• B. Four-chambered hearts
• C. Backbones
• D. Porous bones

Answer 1

The correct option is D Porous bones

Although birds and mammals are very different types of animals, they do have certain characteristics in common which are:

Both are vertebrates with backbones.

Both are endothermic or warm-blooded.

Both have four-chambered hearts.

As they are different types of animals, so some of the dissimilarities are:

Bodies of birds are covered with feathers and that of mammals with hair.

Birds are oviparous and mammals are viviparous.

Birds have light, porous or hollow bones, whereas mammals have denser bones.