Breeder

The Breeder is a new enemy boss scheduled to appear in the new Extinction level, Nightfall.

Appearance
The Breeder is a large, spider-like creature that is armed with large claws.

In Game
The Breeder was dubbed by Infinity Ward as 'the largest boss that we've ever done'. In the trailer, the Breeder is seen stabbing a person in the chest with sharp claws.