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The American is one of the larger crocodile species. Males can reach lengths of 6.1 m (20 ft), weighing up to 907 kg (2,000 lb). On average, mature males are more in the range of 4.1 m (13 ft) to 4.8 m (16 ft) in length weighing about 400 kg (880 lb). As with other crocodile species, females are smaller; rarely exceeding 3.8 m (12 ft) in length.
Jaguar (Panther onca). Jaguars can reach up to six feet in length -- from their nose to the tip of their tail -- and stand up to three feet tall at the shoulder. The average male jaguar weighs about 120 pounds, but some individuals can weigh as much as 300 pounds. At birth most jaguars weigh only two pounds.aguar (Panther onca). Jaguars can reach up to six feet in length -- from their nose to the tip of their tail -- and stand up to three feet tall at the shoulder. The average male jaguar weighs about 120 pounds, but some individuals can weigh as much as 300 pounds. At birth most jaguars weigh only two pounds.