Im not sure if they strictly count as the tree they were on is in my neighbour's garden, but was able to see 7 cormorants from where I was sitting in my garden.
My neighbour doesn't really appreciate them as they take all the fish out of the lakes adjacent to our properties, but I find them facinating. they look really weird in flight and a bit vulture-like when resting in the tree with their wings outstretched.
I also managed to record the pair of grey herons nesting on the lake.
Great photo though, I've never seen them in trees before