Thanks to both of you for looking at the pictures.
Comparing the SX50 with the P600 is a little subjective. Both produce nice pictures and the quality of those shots are pretty close. It really boils down to what you need and how you plan to use the camera. There are features on the Canon SX50 I miss when using the Nikon. Here is a link to some SX50 shots I have taken (I hope it works):
https://plus.google.com/photos/102508618965016893609/albums/5816990905220612225?banner=pwa
There were two reasons I picked up the Nikon. First, the extra megapixels make it possible to crop a picture and still have enough left to make a decent print. Second, the extra zoom. I didn't know how the digital zoom worked on the Nikon until I got it, but it turns out I like it better than the Canon which jumps from 100 optical to 1.5 digital. The latter can produce some images that are hard to fix in post processing so I seldom used it.
The eagles nest you saw in the Nikon collection is the exact reason I bought the SX50, and now the P600. I've watched that nest and pair of birds for several years and even bought a 100-400 lens for my Canon SLR in hopes of getting some good pictures. However, the nest is just too far away even for that combo. The SX50 did much better at 1200mm, but the Nikon has allowed me to get the best shots to date. I can't get any closer for legal reasons so I need to rely on the camera to get close.
When shooting a bird around the birdfeeder, the results are about the same for both cameras. I think the Nikon focuses a little faster. I have the custom setting on both cameras set at ISO 100 which I feel gives the best results. With the Nikon I found the pictures were too sharp for my taste, so I had to knock down the sharpness in the camera a little. Nevertheless, I think the Nikon's additional resolution is a plus you can see in the long-zoom pictures of birds.
To get the results I want, I usually shoot a number of shots and sort through them later on the computer. I think I get more keepers with the Nikon than I did with the Canon when handholding, but find the additional zoom makes keeping on target much more difficult. A trusty tripod is almost a requirement with the Nikon when you zoom all the way.
The thing I miss the most when using the Nikon is the remote control I had with the SX50. For that reason I keep the multiple exposure option on so when I push the shutter I get two or three shots, hoping the second or third picture will not show any shutter vibration. It helps, but means sifting through even more images.
Finally, I experimented with landscape and other types of shots with both cameras and, again there was little difference, except the Nikon had the extra resolution and the Canon had the punchy color. Nevertheless, I would normally rely on another camera for those kinds of pictures. When I go to Hilton Head in a couple of weeks, my bag will contain the P600 and my Olympus M-1 with the 12-40 lens. The P600 will do the wildlife and the Oly will take care of everything else.
Larry