"Screening" by Welcome Swallows

[Peter Shute <>]

And "sallying" too, please, while you're at it.

Peter Shute

 wrote on Sunday, 16 November 2008 10:27 PM:

> 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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