When a stoat can’t chase down a rabbit, it breaks out the dance moves. All the dashing and thrashing hypnotizes the stoat’s prey until it can deliver the killing stroke.
When western scrub jays encounter a dead bird, they call out to one another and stop foraging.
The jays then often fly down to the dead body and gather around it, scientists have discovered.
The behaviour may have evolved to warn other birds of nearby danger, report researchers in California, who have published the findings in the journal Animal Behaviour.
They conducted experiments, placing a series of objects into residential back yards and observing how western scrub jays in the area reacted.
The objects included different coloured pieces of wood, dead jays, as well as mounted, stuffed jays and great horned owls, simulating the presence of live jays and predators.
Alarming reaction
The jays reacted indifferently to the wooden objects.
But when they spied a dead bird, they started making alarm calls, warning others long distances away.
The jays then gathered around the dead body, forming large cacophonous aggregations. The calls they made, known as “zeeps”, “scolds” and “zeep-scolds”, encouraged new jays to attend to the dead.
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Some humans may be willing to travel far for fine dining, but that’s nothing compared to a sooty shearwater: these birds, which are based in New Zealand, fly roughly 40,000 miles each year to reach their seasonal feeding grounds along coastal California, Alaska, and Japan–and some even clock 620 miles in a single day.
Though it looks chaotic at first glance, this migration map, which shows the electronic tracks of 19 shearwaters created by UC Santa Cruz biologist Scott Shaffer in 2005, color-codes the various legs of their trek: light-blue lines track the birds during breeding season, yellow lines represent the northward journey, and orange lines show the winter feeding grounds and southward return. And if you look closer, as the bottom panels reveal, the journeys to the three breeding grounds have one major thing in common: they form figure-eight patterns on a global scale. Unfortunately, as monitoring efforts continue, we may see these pretty patterns cut short: warming temperatures could deplete phytoplankton populations, which means less fish, squid, and krill for the birds to feast on, and could affect whether sooty shearwaters have enough energy to make it back to their New Zealand breeding grounds.
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