Elk are powerful and fast. They're grey in the winter and turn brownish again in summer. The coastal elk where I live spend a lot of time out in the mudflats, I think they lick the salt deposits there. They're also hunted for food, so they're very wary during the autumn during hunting season, and spend more time hiding then.
Their antlers, like deer's antlers, are shed every year. You can find these discarded antlers in the woods here. They're massive. Elk "bugle" too, a sound which summarizes, for me, the coastal woods in spring.