"Firehole haiku" - autumn's morning chill reveals dragon's breath below Firehole geyser basin Yellowstone National Park

"knock down, drag out" - Taunts delivered from a safe distance, then the Pronghorn gauntlet is thrown! But when it came time to actually make good on his threats, this hefty challenger (left) was no match for the reigning champion. Stud rights stay in-house for yet another season, and the younger buck limped off to lick his wounds and plot next year's revenge.Yellowstone River uplands near Tower; Yellowstone National Park

"autumn dog" - Have you ever received a "stink-eye" from Trickster himself?Blacktail Plateau; Yellowstone National Park

"Big World" - Summertime, and the livin' is easy for this youngster along the Firehole River.Yellowstone National Park

"calf deep" - Midstream confusion results from a first encounter with a photographer.Firehole River; Yellowstone National Park

"the waning years" - The old bull takes his sunny afternoon siesta.Swan Lake Flats; Yellowstone National Park

"Alive in the West" - The next generation pauses on wobbly legs, as the Herd Mothers maintain a staunch 'rear guard action'.Hayden Valley; Yellowstone National Park