3-5 feet
Medium-sized and stocky body
20 to 30 cm
Small and slender
Approximately 13-15 inches
Small, stocky body with a short neck and a thick bill
1.5 - 2.5 meters
Stocky with a barrel-shaped body
Up to 70 cm (27.5 inches)
Flat oval-shaped shell with a distinct pig-like snout
30-35 cm
Medium-sized bird with a compact body and short legs
15 to 23 cm
Small and compact
Up to 1.4 meters (4.6 feet)
Elongated, torpedo-shaped
16-19 inches
Large and robust
0.5 to 1 inch
Oval
3-7 mm
Cylindrical
45-58 cm
Slender and agile
11-14 cm
Small, compact
3 to 6 feet
Slender and cylindrical
6-10 inches
Compressed and oval
6-8 mm
11-15 cm
About 30-76 cm (12-30 in)
Streamlined and elongated