Hi Colin,
There's a very interesting paper by Remsen and Robinson in Studies in
Avian Biology No.13, entitled 'A classification scheme for foraging
behavior of birds in terrestrial habitats'. Sally and screen are both
attack behaviours categorized as wing-powered aerial manoeuvres.
According to R and R, to sally is to fly from a perch and attack a food
item that is either in the air or on a hard substrate like a branch.
There are several subcategories of sallying, like sally-strike,
sally-hover, etc. In contrast, to screen is to attack in continuous
flight. Screening is both a method of searching and a method of
attacking prey. Different authors use different terminology. For
example, hawking can mean sallying to some people and screening to
others. The valuable thing about R and R's article is that they explain
their classification scheme in great detail and also indicate how other
researchers use the terminology.
Cheers,
Merrilyn
Colin Scouler wrote:
Hello all,
Referring to the foraging techniques of Welcome Swallows, HANZAB says:
"Forage aerially, taking prey by sallying or screening..."
I can't find the term "screening" in the glossary, and none of the
dictionary definitions seem to fit.
Can someone explain what "screening" means in this context?
Thanks,
Colin Scouler
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