Birds and mammals are both warm-blooded animals with separate sexes determined by genetics, spinal cords, four-chambered hearts, four limbs and well-developed bony skeletons. Both groups include species that can fly and ... More »

Closely related organisms often share similar structures in their bodies, despite their different lifestyles. The simplest explanation for such similarities is that both species descended from a common ancestor with simi... More »

Echinoderms and chordates are related in the sense that they both belong to the deuterostome superphylum, exhibiting somewhat similar patterns of early development during the embryonic stage. The differences between the ... More »

Reptiles are cold-blooded vertebrates which generally have scales, four limbs with five toes each, and hearts with three or four chambers. Most also lay eggs with leathery shells, which are protected from dessication by ... More » Science Biology Zoology

Mammals and birds have four-chambered hearts. However, birds have much larger hearts in proportion to their size than mammals do, and their hearts pump more blood per minute than mammals of the same size. More »

The anatomical and physiological features birds and mammals have in common are possessing a spinal cord and vertebral column, four-chambered hearts and warm-bloodedness. Birds and mammals also both generally invest a gre... More »

The temperate forest is home to many different animals including several species of mammals, insects, birds, amphibians and reptiles. Skyenimals, a web source, gives a full list of the animals found in this habitat. More »