Two birds on left are Double-crested Cormorants; bird on right is an Anhinga (click to enlarge)

Anhinga

• Slim head
• Long slender neck
• Long, thin pointed bill
• Large silvery wing patches
• Long fan-shaped tail with light tip
• In flight, neck is extended
• May look like a snake swimming with only head and neck exposed

Double-crested Cormorant

• Larger head
• Stout neck
• Blunt bill with hooked tip
• All dark wings
• Shorter tail
• In flight, neck has kink
• Swims with body low in water