A moose is not really grazing, whatever it looks like. They are browsers, built to eat leaves, twigs and aquatic plants rather than grass, and the long legs and high shoulders that make them look ungainly are the right shape for reaching up into willows and down into ponds rather than down into turf.

Those antlers are annual. He grew that entire structure from nothing since spring, at a rate among the fastest of any mammal tissue, and will drop it in winter and start again. It is one of the most expensive things any animal does, which is precisely the point: an antler is an honest signal, because only a bull in genuine condition can afford to build one.

The indifference to traffic in your caption is real and is not tameness. Moose simply do not regard people as a threat worth reacting to, being large enough not to need to, and that combination of enormous size and complete lack of concern is what makes them more dangerous to approach than almost anything else in the Rockies.