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From: weutil@ih1ap.UUCP (David Pope)
Newsgroups: net.rec.birds
Subject: Re: random twitterings
Message-ID: <351@ih1ap.UUCP>
Date: Thu, 21-Jun-84 14:39:30 EDT
Article-I.D.: ih1ap.351
Posted: Thu Jun 21 14:39:30 1984
Date-Received: Fri, 22-Jun-84 06:36:22 EDT
References: <1359@pur-phy.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 14



    I have witnessed this circular flying pattern you describe in barn
swallows, and it is my understanding that these birds will fly like this
(sort of 'terrain following') in search of bugs. The bugs fly close to the 
surface of warmer objects as the evening air cools and the humidity increases.
If the chimney were covered with flies, the swifts might be attracted in a
similar manner.

 
	
		David L. Pope
		Mail --> ihnp4!nwuxc!random