1. An innate, genetically determined behavioral pattern or drive that is not learned and is common to all members of a species
The biological instinct to protect one's offspring is strong in most mammals.
O instinto biológico de proteger seus filhotes é forte na maioria dos mamíferos.
2. A natural, involuntary impulse to act in a certain way, especially for survival or reproduction
Hunger is a biological instinct that compels animals to seek food.
A fome é um instinto biológico que compele os animais a procurar alimento.