Up to 1.5 meters
Slender and elongated
55-66 cm (22-26 in)
Large and muscular
5.5 to 6.3 inches (14 to 16 cm)
Compact and round body with a large head
Approximately 2 meters
Bird-like
Varies by species; ranges from about 5 inches to 28 inches
Compact and rounded body with a large head, forward-facing eyes, and a hooked beak
10 - 15 cm (4 - 6 inches)
Large and robust
2-5 cm
Long and slender
6.9 to 9.8 feet
20 - 22 cm
Small to medium-sized bird with a compact body
Around 7-15 cm (2.8-5.9 inches)
Irregular oval shell
Up to 15 inches
Stocky and broad
Up to 20 inches
Streamlined and elongated