Final answer:A main characteristic thatmammals sharewith birds is being endothermic, which means that both these vertebrates regulate their body heat internally. While mammals are characterized by having hair and mammary glands for nourishing their young, birds typically have one occipital condyle, a uropygial gland, and lay eggs.Explanation:Mammals and birds do display numerous distinguishing characteristics; however, there is one area where they are notably similar - both birds and mammals areendothermic, meaning they maintain a constant body temperature internally, irrespective of their environmental conditions. Both groups have developed several strategies for managing body heat. Some other shared characteristics include: having a backbone and being vertebrates, but their specific characteristics diverge from there.Distinctive characteristics of mammals include possession of hair andmammary glandswhich are used to feed the young, and different groups of mammals (monotremes, marsupials, and eutherians) also exhibit certain exclusive traits. For example, monotremes are unique as they lay eggs, while marsupials and eutherians give birth to live young.For birds, they are characterized by having a specialized uropygial gland for feather maintenance, a distinct skeletal structure such as an only one occipital condyle for extensive head and neck movement unlike mammals with two occipital condyles, and a beak instead of jaws with teeth. Moreover, birds don’t have multiple body openings unlike mammals and lay eggs instead.Learn more about Characteristics of Mammals and Birds here:brainly.com/question/34228250#SPJ11...

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