Hi CF, family issues have kept me from birding much since I got the P900 back from the shop. We did go to Galapagos and Tandayapa Ecuador for two weeks and I took the P900 (weight restrictions on the flight from Quito to Baltra kept me from bringing both cameras.)
The Nikon performed well, but the critters on the islands are so approachable, I really didn't need 2000mm eq......sometimes found myself wishing I had a larger sensor camera that could have handled the high dynamic range of the light there a little better.
That was especially true when we got to the Tandayapa cloud forest, where the mostly low/dappled light conditions kept the P900 from auto-focusing accurately. I know the SX50 would have struggled in those conditions too, and would really like to know how a camera like the Panasonic FZ1000 would have performed there. It's auto-focus speed and EVF are said to be superb, but it's optical zoom range only goes to 400mm eq., which is why I've never seriously considered buying it.
Canon recently released a 1 inch sensor camera (G3X) but it's optical range is still only 600mm, so I guess I'll be waiting a while longer to "have my cake and eat it too."
In the meantime, the P900's lens is super, and I've had no more freezing or other issues. If this camera was just faster, I'd be a happy camper. Maybe the SX70 will lure me away, but for now the Nikon's become my primary birding camera. Whether or not it will remain so when fall warblers start showing up is another question......
I've started a P900 Galapagos folder, will take me a while to get everything in there, but here's a link if you want to see a few;
https://www.flickr.com/photos/127980272@N06/albums/72157655165823583/with/20074383624/