What is the difference between altricial and precocial, as applied to mammal offspring?

• A. Altricial offspring require parental care after birth; precocial are independent early.
• B. Precocial offspring are helpless and need care; altricial are mature.
• C. There is no difference between altricial and precocial.
• D. Both are equally independent at birth.

Answer: (C)

Altricial and precocial describe how developed mammal babies are at birth and how much care they need from parents. Altricial offspring are born in a relatively helpless state: often blind, hairless or sparsely furred, unable to move well or regulate their body temperature, and they depend on their parents for warmth and feeding for a long period. Precocial offspring, on the other hand, are born more mature: eyes open, fur present, able to stand, walk, and feed themselves soon after birth, requiring much less intensive parental care right away. This difference reflects different reproductive strategies: altricial young rely on substantial parental investment after birth to develop skills and brain growth, while precocial young are ready to cope with the environment more quickly with less immediate parental input. So there is a real difference between the two, and the statement that there is no difference isn’t accurate—the contrast is in development at birth and the level of dependency that follows.