Dear Brian.

Thanks for your valuable insight. I also suspect that the bulk of the  
flock was Amurs, and did not get a good enough look at the others to  
conclude that there were some eurasian hobbies.

Regards,
Felix
On 02 Dec 2011, at 6:38 AM, Brian Finch wrote:

> Dear Felix,
> I am sure they would have been Amurs, Eurasian Hobbies to not
> associate in such large congregations. Female and immature Amurs look
> quite hobby-like with the pale throat and in dark skies the underwing
> contrast of the male is not as evident as in clear skies.
> A very good record for Nairobi.
> Best for now
> Brian
>
> On 12/1/11, Koimburi Felix <felix.njenga@gmail.com> wrote:
>> Goodmorning all.
>>
>> Yesterday evening (Wednesday 30th November), two friends and I
>> witnessed what looked like migration of falcons. Literally hundreds
>> (500+) of them were flying overhead, moving in a roughly north-
>> westerly direction. We witnessed this from my mum and dad's home in
>> Hardy, Karen. I was overawed by the sight, seeing that it was my  
>> first
>> time seeing such a large migrating flock.
>>
>> Did anyone else see this yesterday? I would also appreciate help in
>> confirming that it was indeed Amur falcons that I saw, and not, say,
>> Eurasian hobbies. The sky was overcast, and so the lighting was not
>> that great. The distinctiveness of the falcon silhouette was however
>> clearly visible, but the two-toned underside wing of the Amur was not
>> very evident. In at least two birds, I observed a white throat patch,
>> suggesting the E. Hobby, but the dusk light made it difficult to
>> observe much more than that. Does anyone know if the two travel
>> together?
>>
>> Looking forward to hearing what the experts have to say.
>>
>> Felix
>>