Katmai’s brown bears are among the largest bears on Earth. Standing 3–5 feet at the shoulder and stretching 7–10 feet long, they are less “large animal” and more “walking pile of muscle with a snack agenda.” By mid-summer, adult males are already tipping the scales at 600–900 pounds. But as winter approaches, they enter their annual transformation phase: less “bear,” more “professional food storage unit.” By October and November, some large males can weigh over 1,000 pounds. Adult females are typically about one-third smaller than males, but still impressively chunky because in the bear world, “getting ready for winter” means turning calories into a luxurious layer of portable insulation. Same.