Read the passage carefully and answer the question below.
Lions don't take much interest in hunting as compared to lionesses. According to experts, more than three-quarters of kills are made by lionesses. The lioness stays ahead in search of prey, the cubs playfully follow her, and the lions stay behind the pride nodding their massive heads as if they were bored with the hunting. But this sluggishness of lions may contribute to the survival value as when the lioness is busy hunting, and the males protect the cubs, protecting them from other animals, especially hyenas.

Q) Sluggishness is a/an ______________.