Subject: How do crows and seagulls accelerate into a strong wind without gliding?

I am a student pilot, and nobody in the aviation circles I have spoken to 
can explain this phenomenon to me.  Many cite the fact that birds "soar" 
or "glide", however both of these maneuvers involve the bird (or aircraft) 
propelling itself forward with the aid of gravity (via dlow descent) or an 
updraft of wind.  In the scenario I seek to explain, for example by the 
shores of a lake, the winds are 10 to 20 knots and the birds manage to 
remain in place over the same spot and then fly forward at the same 
(apparent) altitude.    Thank you for your help!!

Re: How do crows and seagulls accelerate into a strong wind without gliding?