I'm not sure that it is quite that clear-cut - if you are vaguely seal-shaped, and furthermore not moving with the speed and agility of a healthy seal, you migh

I'm not sure that it is quite that clear-cut - if you are vaguely seal-shaped, and furthermore not moving with the speed and agility of a healthy seal, you might push a big shark's 'looks like food' button. Staying together in a big, tight group might have been key.