In the video, a young male hooded seal appears bobbing along a slab of ice, where a female is nursing a pup. A larger male is nearby who seems to have claimed the females.
The younger male jumps on the ice to intimidate the older male. He inflates his nasal cavity, which blows up like a black balloon on his forehead. The older male does the same. The display is accompanied by clicking sounds that echo in the inflated sac.
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The older male eventually slinks back into the water.
Encouraged, the younger male heads towards the female and inflates once again. But this time, it comes out of his left nostril, appearing like a bright red balloon, as illustrated below.
The female is unimpressed and sends the younger male on his way with a bite on the tail.
"With only one day in the year in which to mate, the female is understandably choosy," Attenborough said in the documentary.
"And until the youngster has grown a more impressive balloon, he's unlikely to be chosen. No wonder he's deflated."
These massive animals, which can weigh up to 776 pounds and measure up to 8.5 feet, are mostly solitary. During most of the year, they are fiercely territorial and will fend off competitors more aggressively than other seals, per NOAA.
They only come together when they migrate to their breeding grounds east of Greenland over two or three weeks in the spring.
It contains about 60% fat. By comparison, gourmet ice cream is only about 16% fat, per Insider's Uma Sharma and Shira Polan.
The fatty food allows the pups to double in weight in their first week of life. Hooded seal pups are weaned off the milk in just four days, the shortest time for any mammal.
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