These shots were made somewhere in west central Montana. According to Wikiedia: Adults typically measure 138–158 cm (54–62 in) long, weigh 7.7–12.7 kg (17–28 lb), and have a 203 cm (80 in) wingspan. This is the largest extant species of waterfowl. Exceptionally large male Trumpeters can reach a length of 183 cm (72 in), a wingspan of 3.05 m (10.0 ft) and a weight of 17.2 kilograms (38 lb).
30 pounds. That's a lot of weight to fly fueled by self-contained energy for the several hundred miles they migrate each year. Amazing.
One always kept an eye on me. Birds that frequent places near roads have learned that moving vehicles are not a threat, unless you're between them and where they're going. They do pay attention when a vehicle stops near them. "C'mon buddy. Just move along. Nothin' to see here."