Last Saturday, I promised I'd share the rest of my b & w Yellowstone pictures, so here they are:
This formation, I think, is known as the buffalo. It does have that shape to it. The buffalo is one of the hot springs in the Mammoth Hot Springs area.
As you drive into the Mammoth Hot Springs area from the south, you look out across a valley to a dramatic rock face.
And finally, a trumpeter swan preening in a small lake. We found two swans and were able to approach quite closely, as long as we took a few steps at a time and gave the birds to become used to our presence.