00:01
A keystone species.
00:03
What that is, is, well, it's named after a keystone in a building structure.
00:08
So you have all these different stones here forming a door, and this is the keystone.
00:12
If i remove this rock, the whole thing comes crumbling down.
00:17
So in an ecosystem, that's when you have a bunch of different species with a lot of different relationships, but one of those species have a disproportional amount of effect on the environment compared to how many of them there are.
00:31
So let's say you have a plains, a bunch of grass in an area, and like cows and stuff.
00:37
Even though the grass is essential for the environment to function, it's not a keystone species because there's a lot of it.
00:43
You need something like a small amount of something that has a big impact.
00:47
For one example, let's talk about the otters, the urchins, and the kelp...