6 to 13 inches
Short and stout body with a triangular-shaped head
Up to 16 feet (4.9 meters)
Large and stout body with a blunt snout and long, serrated teeth
Up to 1.8 meters (6 feet)
Slender and elongated
3.5-6.3 inches (9-16 cm)
Butterfly
3.5-5 cm
Cylindrical
Up to 25 inches (63 cm)
Streamlined and elongated
Approximately 9 feet
Fish-like with limb-like fins
3 to 5 feet
Heavy-bodied with a triangular head
Up to 3 meters (10 feet)
Large, cylindrical body with a triangular head
Up to 35 inches (90 cm)
Elongated, snake-like body with small, stubby fins
6.5 to 16.7 cm
Elongated and cylindrical
Up to 40 feet
Long and cylindrical
Up to 100 feet
Large and long-necked
Up to 15 inches
Squat, large head, and a wide mouth
3-4 inches
Caterpillar-like
9-14 inches
Compact and small
58-70 cm (23-28 inches)
Medium-sized
Ranges from a few inches to several feet
Dome-shaped shell, sturdy built