Up to 2 meters (6.6 feet)
Sleek and slender with a long and thin body
Up to 3 cm
Slender and flattened
7-11 inches
Small and compact
4-10 mm
Cylindrical
Varies depending on species
Slender and elongated
18-22 inches (46-56 cm)
Muscular and stocky
10-14 inches
Small and Compact
About 7 feet (2.1 meters)
Slender and streamlined
Varies
Small to medium-sized
22-27 inches
Medium-sized, muscular
Typically around 50 cm (20 inches)
Short and stout
12-16 inches (30-40 cm)
Compact and muscular
Approximately 10-15 inches (25-38 cm)
Small to medium-sized, compact and muscular
48-53 cm (18.9-20.9 in)
Slender body with long tail
56-70 cm
6 to 12 inches (15 to 30 cm)
Streamlined and cylindrical
Up to 25 cm (9.8 inches)
Large and robust
Up to 1.5 meters
Long and segmented body