Birds or Leaves?

I took this picture with flash, but it is not showing up clearly. Click on pic to see the bigger version. It is only 630pm or so. But see that black things on the branches of the trees, look like leaves, but they are actually birds. Many many birds, all roosting on the trees.

When I took the picture and the flash went off, it was scary! Cos all the birds started flying off, lucky not towards me :p

Note to self: Never take picture with flash outside cars if subject can be violent.

PS: This is taken just outside the ebay office in Burnaby - the 4th customer support center.