to remain silent or hold oneself aloof in a sullen, ill-humored, or offended mood: Promise me that you won't sulk if I want to leave the party early. a state or fit of sulking. sulks, ill-humor shown by sulking: to be in the sulks. Also, sulker. a person who sulks.
Some cite the fact that secretions from the millipede repel other insects as a reason why they are beneficial. While millipedes do not bite, the sight of them can still be unnerving, especially when they appear in large numbers. They have the ability to crawl up walls and enter homes through small openings.
Smaller centipedes will catch other invertebrates, including insects, mollusks, annelids, and even other centipedes. The larger tropical species can consume frogs and small birds. The centipede usually wraps itself around the prey and waits for the venom to take effect before consuming its meal.