 Although Triatominae bugs feed on them , birds appear to be immune to infection and therefore are not considered to be a T. cruzi reservoir . Even when colonies of insects are eradicated from a house and surrounding domestic animal shelters , they can re @-@ emerge from plants or animals that are part of the ancient , sylvatic ( referring to wild animals ) infection cycle . This is especially likely in zones with mixed open <unk> , with clumps of trees interspersed by human habitation . 
