It’s something all whale-watchers yearn to see. The sight of whales breaking the surface and slapping their fins on the water is a true spectacle – but the animals don’t do it just for show.
(From New Scientist / by Alice Klein)– Instead, it appears that all that splashing is about messaging other whales, and the big splashes are for long-distance calls.
Humpback whales regularly leap out of the water and twist on to their backs – an action known as breaching – and slap their tails and fins in a repetitive fashion. The resulting sounds travel underwater and could possibly communicate messages to other whales.
The team found evidence for this idea. The animals were significantly more likely to breach when the nearest other whale group was more than 4 kilometres away, suggesting that the body-slapping sound of breaching was used to signal to distant groups.
In contrast, repetitive tail and pectoral-fin slapping appeared to be for close-range communication. There was a sudden increase in this behaviour just before new whales joined or the group split up.
It is vital for migrating whales to conserve energy because they do not eat during this time. The fact that these slapping actions were so regular and vigorous was evidence of their importance, Kavanagh says.
Read the full article here: https://www.newscientist.com/article/2114953-whales-talk-to-each-other-by-slapping-out-messages-on-water/