21 to 27 inches
Medium to large
Generally between 8 and 10 feet, but can reach up to 14 feet
Large and heavy-bodied
70 - 105 cm (27 - 41 inches)
Medium-sized, stocky body with long legs and a short tail
15 - 18 cm
Small with a stocky build
Up to 3 meters (10 feet)
Large and robust
Up to 150 cm (59 in)
Medium to large-sized, muscular body
60-70 cm (23-28 inches)
Large and muscular
1.2 to 1.4 meters
Slender and muscular
About 12-15 inches
Small to Medium
Varies depending on the species, ranging from 1.5 to 10 feet
Slender and elongated
5 to 7 meters (16 to 23 feet)
Serpentine
25-30 cm
Small, compact
5 to 25 mm
Elongated and oval
Medium
Medium-sized
17 to 36 inches (43 to 91 cm)
1.7 to 2.8 meters
Up to 1.2 meters
Streamlined
2 to 5 feet
Hammer-shaped head and slender body