a flea gets food while a lemming is itchy
The arctic hare and lemming both eat grass, and since grass is not unlimited, they must sometimes compete to get it.
it would work if they were both icy cold
An example of parsitism in tundra is tape worm in caribou. The tape worm takes in the nutrients in the caribou. Soon the caribou dies and the tape worm gets its food.
Syngamus sp. in tundra voles..
Tapeworms that grow in the bodies of the animals. (Parasitism)