Konrad Lorenz, an Austrian scientist who won the Nobel prize for his behavioral studies of humans and animals, died Monday of kidney failure at age 85.

Lorenz was famous both for his groundbreaking research and for the best-selling studies of human and animal behavior that won him a worldwide reputation as a great humanist. In 1973, his behavioral research won him the Nobel Prize for Medicine along with the scientists Karl von Frisch and Nikolaas Tinbergen.In science, Lorenz was best known for his discovery of a process known as imprinting, or the rapid and almost irreversible learning process that occurs in early childhood, bonding animals to their biological mothers.

But he showed the process could be changed, demonstrating that mallard ducklings, for example, would happily follow a human who greeted them shortly after birth and imitated quacking.