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These birds always pass by my window making weird but nice sounds. They are swift fliers and it's a challenge taking their photos while in flight. I was lucky enough to spot them perched on a tree by Lake Momella.
Thanks, Emma, for the ID.
And thanks, Livan, for the clarification. I'll make some revision on this posting.
Last three pictures are: Lesser Striped Swallow (Hirundo abyssinica syn. Cecropis abyssinica)
http://en.wikipedia.org/wiki/Lesser_Stri...
The first 2 groups on the branch do look as (rustica) European or Barn swallows as Emma said.