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There is rubbish in books too. For example that swift cannot start to fly from ground.
That's true. A fit adult swift can take off from the ground. The ones you find grounded are usually youngsters or unwell.
Also....did you know that Swifts have four toes arranged in twos each pair pointing sideways....like a chameleon; that they are the fastest bird in level flight, only the Peregrine in stoop being faster.
All birds have fleas and feather lice or similar parasites. However the swift’s are so different to those of other species that it supports the fact that they separated from other bird species a very long time ago. Their parasites have evolved with them.