Varies greatly depending on the species
Polyp
20-30 inches
Slender with a small, pointed head
30-36 cm (11.8-14.2 in)
Medium-sized parrot with a stocky build
Varied
Medium
10-12 inches (25-30 cm)
Medium-sized with short legs
Approximately 20-24 inches
Medium-sized, muscular
22-28 inches (56-71 cm)
60 - 100 cm
Slender, long neck, hooked bill
1.2 to 1.6 inches (3 to 4 cm)
Cylindrical
20-24 inches
Medium-sized, slender
3 to 5 feet
Slender and cylindrical
2-3 inches
Compact and streamlined
About 2 meters
Large and bulky
3.5-4 inches
Small and streamlined
25-30 cm
Compact and sturdy
8.5 to 13 inches
Small and compact
Adults can reach up to 4-5 feet (1.2-1.5 meters) in length
Thick and muscular
4-5.5 feet
Slender and agile