attract –v. to cause (someone) to like or be interested in something

ecologist –n. a person who studies ecology: the science that deals with the relationships between groups of living things and their environment

tune –n. a series of musical notes that produce a pleasing or recognizable sound

accelerate –v. to move faster; to gain speed

decline –v. to become less in number or lower in amount

nest –n. a place where birds lay their eggs and raise their young

instinctive –adj. relating to or based on behavior that is not based on thinking or learning