Thousands of Crows Migrating!

 

I have always wondered about how many crows are there in Vancouver area.  Thousands?  Millions?

Yesterday, after raining, the sun came out before sunset.  I started seeing waves and waves of crows flying eastward.  Hundreds and thousands of them.  They came in 3 waves:  5 minutes a wave with 10 minutes of break in between.  

Here are the pics, the crows are the dots in the sky:

It is hard to see in these pictures, but there are sooooooooo many....thousands.

the sky is filled with small dots.  I wondered where they are heading.  (or if they are sleeping in Burnaby Lake Regional Park.)