Here are two species of birds with different nesting habits. There is a place however that both of them would call home.
Work out where it is. You can check here for confirmation.
Now go to the indicated location. There you will find 15 bold numbers, which you should list in order as abcdefghijklmno.
The cache is at N51 1j.(o+k+e)(h+a+h+a)f W(o-o) lk.(i+d+d)(i*n)g
