Thorleif Schjelderup-Ebbe
Thorleif Schjelderup-Ebbe was a Norwegian zoologist and comparative psychologist. He was the first person to describe a pecking order of hens. Wikipedia
Born: November 12, 1894, Oslo, Norway
Died: June 8, 1976 (age 81 years), Oslo, Norway
Children: Dag Schjelderup-Ebbe
Parents: Axel Ebbe and Menga Schjelderup-Ebbe