What did Konrad Lorenz do?

Answer 1

Konrad Lorenz who was an Austrian zoologist was among the first to describe attachment behaviours of geese soon after they hatched. He found what 'imprinting' was. This is an experiment he did:

In his classic experiment, Lorenz divided eggs laid by a graylag goose into two groups. One of the groups was hatched by their mother and immediately began following her around. The second group was hatched in an incubator (in absence of their mother, they began instead to follow Lorenz). Even if Lorenz placed the goslings in a box, so that both groups were separated from their mother or himself, they would reliably segregate towards their mother or toward Lorenz, according to what they were first exposed to. Although Lorenz was the first to name this phenomenon 'imprinting', earlier scientists had made similar observations. Later investigators would determine that imprinting in ducks, geese and other species of birds occurs between 12 and 17 hours after hatching. This led to the notion that there are 'critical periods' in the development of the brain and behaviour. Overall, Konrad Lorenz's experiments pointed the way toward helping us understand that early experience helps to 'shape' social behaviour in adulthood.

Answer 2

He discovered Imprinting of birds.

Answer 3

Imprinting in geese