Evidence is mounting that several animals can learn behaviors from their peers, and pass down these traditions from generation to generation -- an ability once thought to be uniquely human.
The latest study to document social learning in animals, published today (April 25) in the journal Science, has found that humpback whales learned a new feeding technique from other humpbacks, a trait that stuck around and spread throughout the population.
In 1980, a whale in the Gulf of Maine (off the coast of New England) was first seen slapping its tail on the surface of the ocean before feeding on a type of fish called sand lance. This behavior soon spread and was passed down over several generations. It's now a commonplace behavior in humpbacks throughout the region, said Jenny Allen, a study co-author and researcher at the University of St. Andrews in Scotland.
27 years of data
It is difficult, of course, to prove that a certain behavior is learned socially, especially when it comes to marine animals. But the researchers behind the study developed a powerful computer model that allowed them to compare the likelihood that this behavior arose via social interaction versus individual learning.
Drawing upon a database of 27 years of observations of whale foraging, the model returned a result that, at a bare minimum, the humpbacks were 1 million times more likely to have learned the feeding technique from peers than to have each learned it individually.
"It was so big my supervisor made me run it again because he thought I might have messed it up somehow," Allen told LiveScience. "It was so startling to have that strong a result."
The whales perform this behavior, slapping their mammoth tales on the surface one to four times, just before diving and bombarding their prey with bubbles, which helps to organize them into schools upon which the whales can more easily feed, Allen said. The purpose of the technique, called lobtail feeding, is unclear, but it's possible it helps organize the fish into tighter formations before mealtime, she added.