The Brown Creeper

Nikon D750, Nikkor 200-500mm f/5.6 @ 500mm, 1/500, f/5.6, ISO 100

This is a neat little bird.  It flies to the base of a tree and works its way up by going round and round the trunk and branches, pressing its beak into the crevices of bark looking for insects and spiders to feast on.  When not presented in profile the Brown Creeper can be especially difficult to see as it blends with the tree bark very well.

Nikon D750, Nikkor 300mm f/4e @ 300mm, 1/320, f/4, ISO 100

 Here, this one is working its way around the tree probing the crevices...

Nikon D750, Nikkor 300mm f/4e @ 300mm, 1/400, f/4, ISO 100

and comes up with a tasty morsel.

Nikon D750, Nikkor 300mm f/4e @ 300mm, 1/400, f/4, ISO 100

So, down the hatch it goes.  I almost didn't post this last image because it's blurry due to the shutter speed being too slow but it completes the story so chose to show it anyway.