Nils tipsar om flera sajter om tornseglare:

Internationell (elvaspråkig!) sajt om tornseglare sajt med mängder av information: "Some of the reasons for the Common Swift’s well-known 'swee-ree' call are now understood.
1) It identifies the sex of individual birds (females call at a higher pitch than males) (Kaiser). 
2) It establishes the terrority of a colony (Tigges)."

London's swifts: "Your own home can be a Swift's home too! Create a place for Swifts. Fit wall mounted or internal eaves nest-boxes, and attract the birds in with the Swift calls CD." Wow...

Hannu Anderssons svenska sida

Catwebs sida med tornseglar-länkar

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