1. A ………………………….. is a stage in development during which an animal is particularly likely to learn a particular behavior. 2. Soon after hatching, ducklings become ………………………….. on an object that...

1. A ………………………….. is a stage in development during which an animal is particularly likely to learn a particular behavior.

2. Soon after hatching, ducklings become ………………………….. on an object that moves, usually their mother.