The term is owed to Niko Tinbergen, who did his famous experiments with gulls, where he found that that orange spot on the gull’s beak -- if he made a bigger, oranger spot the gull chicks would peck at it even harder.
Ovaj izraz dugujemo Niku Tinbergenu, koji je radio slavne pokuse s galebovima, prilikom čega je otkrio da ova narančasta točka na galebovom kljunu -- ako tu točku povećate i pojačate boju, onda će je ptići galebova još intenzivnije kljucati.