Quote:
Originally Posted by kstar
They sound like certain Swifts, which fly constantly for years.
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I'm not sure just what you are trying to say here.
But Swifts (family Apodidae) perch on vertical surfaces and nest. So they do not fly "constantly for years". Some Swifts do mate in flight (now that is truely "a flying f*ck"!), but they all spend considerable time each day at rest.
If I have misunderstood your statement, just ignore my correction.