Swifts are hosts to many species of parasite, found on individual birds and in nests. In Africa, parasites include: hippoboscid flies (Gataerina, Pseudolynchia and Ornithomya), feather lice (Dennyus and Eureum) and ticks (Lelaptidae, Proctophyllodiae, Analgesidae and Eustathiidae). Some parasites may have co-evolved with specific species of swifts and are endemic to them.
As insectivores, swifts also affect insect populations throughout their range.
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