The second case is that of defense, for example, Sheep can move in circles when they are nervous in the face of a threat of a wolf attack, for example, what they do is place the females and young in the middle of the circle and the males are located on the outside, but the one who perfectly executes this strategy are the bison before attacks of predators that were circles in the same way, the females and the young are placed in the center and on the outside they turn the males.
The third case is due to illness, experts point out that in this case they could be infected with listeriosis, which is a disease that would force them to walk in circles.
And finally, the most spectacular case is when the collective guide fails, in which case erratic movements can occur, for example, in groups of marine mammals that, when the leader becomes disoriented or become ill, can end up moving erratically and end up stranded on a beach. case of whales or dolphins.
Although the circular movement and also the most impressive that exists and also tragic due to the number of beings involved, is that of the death spiral, it occurs when a group of warrior ants that are blind separate from the main group and lose track of pheromones, and these ants start to follow each other moving in a Circle and cannot be stopped since that circle goes nowhere, the ants can be in that march until they die of sheer exhaustion.
The death spiral was described for the first time by the American naturalist William_Beebe in 1921, it was a brutal phenomenon because he observed a spiral of 370 meters in circumference, it is something brutal, it took each ant 2 hours and 50 minutes according to the naturalist In making a complete turn, the spiral lasted more than two days until a worker in the area broke the deadly circle by erasing part of the pheromone trail that was formed.
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Pigeons do the same, they move around in circles for a couple of minutes often in small colonies.
I imagine, if they are in a flock or group; It's a common factor...
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