| | Wildlife of the Half Life Universe - A Definitive Guide to the Wildlife of the Half Life Universe (Site not responding. Last check: 2007-10-26) |
 | | While the headcrab is predatory in nature it is omnivourous, and will eat plant life if it is failing to take a host, 'de-beaked' headcrabs will become suitable pets, unable to administer there poisons they will display almost affectionate behaviour, including sitting on its 'owners' shoulder. |
 | | Headcrabs can survive for upto a year without a host, and as long as the host body can take, when it has taken a host. |
 | | However nature has it's ways of altering things and as time has gone on many more of the poison headcrabs in the wild are taking hosts instead of leaving the victims for arrest by the Overwatch, although this has not stopped the poison headcrabs grown in captivity being used by the Combine. |
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