Final answer:
Baby kangaroos display instinctive behaviors or reflexes at birth, such as climbing to their mother's pouch and suckling, which are crucial for their survival.
Step-by-step explanation:
At birth, when baby kangaroos climb to their mother's pouch and begin to nurse, they are exhibiting instinctive behaviors or reflexes. These behaviors are critical for their survival and ensure that they remain close to their caregiver, in this case, their mother. The joey's journey to the pouch is fueled by well-developed forelimbs and a strong grasping reflex, which allows them to attach to the mother's nipple and begin receiving vital nourishment from her milk. These reflexes, shared across various species, have evolved to enhance the chances of a newborn's survival by facilitating feeding and reducing the risk of separation from the caregiver.