Dear Fleur,
Edwin Selempo and I had a similar instance though only six birds at
Amboseli Main Gate, in June. Birds were landing on the tower and
investigating the structure, but nothing became of it. I have video to
prove it though!
Best for now
Brian

On 1/9/12, Fleur Ng'weno <fleur@africaonline.co.ke> wrote:
> Exciting start to a survey to search for Clarke’s Weaver:
>
> Some 150 Alpine Swifts circling around the Safaricom tower at Marafa in
> Dakatcha Woodland, Magarini District. They were calling and seemed to be
> investigating it as a nesting site; but surely a telephone tower does not
> provide nesting sites? I can still hear them calling from the Nature Kenya
> office in Marafa.
>
> Wishing you good birding, Fleur