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The Brood are an alien race of insectoids beings. They are a specialized race, one that has evolved to reproduce and consume any available resources.[3]

Despite their resemblance to insects, the Brood have endoskeletons as well as exoskeletons. Also unlike insects, they have fanged jaws instead of mandibles. Their skulls are triangular and flat, with a birthmark (such as the battle axe which is most common in broodlings but are different for each Brood) between their large eyes. Their two front legs are actually long tentacles they can use to manipulate objects.

Due to their natural body armor and teeth, the Brood are very dangerous in combat. In addition, they have stingers that can deliver either paralyzing or killing poison.

Reproduction
The parasitic Brood have the ability to impregnate a host (of any lifeform) with an egg. Each host can only support one egg. When the embryo is grown, the host becomes a Brood, and is effectively dead. They appear to be capable of even infecting demons or someone who is possessed by a demon like Ghost Rider.[4]

They use a hive mind to pass memory to their hosts, which also passes an individual's knowledge, given to a broodling, to the hive and back to the queen, meaning newborn brood know what any member of a race knows. Until the embryo gains the host's body the embryo can only gain temporary control of the host, often without the host noticing as the host is unaware when it loses control.

If the host possesses any genetic powers, the resultant Brood will inherit them. The persona of the host once the Brood is "born" appears to be extinguished, but in some cases, the host's will may be strong enough to survive and coexist with the Brood's.[5] However it is implied that hosts with advanced healing ability are unable to turn, for example when an egg was implanted in Deadpool, instead of turning into a Brood, a small Brood burst out of Deadpool's body.[6]

Brood also have the ability to morph into their host's original form and a hybrid form with characteristics of both the host and the Brood body.

Sound familiar...?