These fish, sensing predators in the area, have formed what's called a bait ball.
这些鱼感知到该地区的捕食者,形成了所谓的诱饵球。
动物逻辑学
The seals dive through the bait ball, mouth wide open, scooping as much as possible.
海豹从诱饵球中潜入,张大嘴,尽可能多地舀食。
动物逻辑学
" they also have the cutest little ears... true seals don't have those either" (00: 02) While charging through bait balls is an easy way for them to fish, they spend a lot of their time hunting in kelp forests.
When you see the writhing sequined mass of a bait ball, meaning a school of fish that swims tightly in a globe, you know they will be picked off by whatever larger thing has caused them to swim so close together.
A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators. Small schooling fish are eaten by many types of predators, and for this reason they are called bait fish or forage fish.