 A moose can have tens of thousands of ticks feeding on its blood at one time, each sucking up to one milliliter of blood.The biting ticks cause a lot of discomfort for the moose, so they try to get the ticks off their bodies by biting off their hair, and rubbing up against trees.This preoccupies moose, and keeps them from browsing for food, which can lead to malnutrition.