Photo: Charles J. Sharp / CC BY-SA 4.0 (Wikimedia Commons)
These remarkable marine herbivores are the only sea turtles that graze on seagrass as adults—an extraordinary adaptation found in Dry Tortugas' shallow tropical lagoons. Green sea turtles migrate thousands of miles between feeding and nesting grounds, and you might glimpse one gliding past Little Africa Patch Reef during your snorkel. Observe from 25 yards back and witness one of the ocean's most inspiring journeys without disturbing these recovering giants.
📏 Keep your distance: Minimum 25 yards
Stay safe
Maintain minimum 25-yard distance. Never touch, chase, or attempt to swim with turtles. Observe from boat or snorkel position without approaching. Report any distressed turtles to park staff immediately. Use reef-safe sunscreen.
If you encounter one
Remain calm and still. Do not approach or corner the turtle. Back away slowly if it appears stressed. Underwater: let it swim away naturally. On surface: retreat and give space. Never grab or touch.
Never feed or approach wildlife — it's dangerous for you and often fatal for them.
🦊 Species ID card
- Identifying features
- Large paddle-like flippers for swimming, teardrop-shaped shell (carapace) in olive to black tones, smooth plastron (underside), herbivorous mouth adapted for grazing—unique among sea turtles.
- Diet
- Seagrass and marine vegetation; unique among sea turtles as herbivorous adults. Juveniles eat jellyfish and small invertebrates before transitioning to plant-based diet.
- Active
- Diurnal; active during daylight hours for feeding and travel. Crepuscular activity possible at dawn and dusk.
- Lifespan (wild)
- Up to 90 years
👀 Where & when to see them in Dry Tortugas National Park
Where to look
Little Africa Patch Reef (primary snorkel site), shallow lagoons near Garden Key, seagrass beds throughout the park accessible by snorkel or boat
Best time
Morning and early afternoon (7 AM–2 PM) when water clarity is peak and light angles best for visibility. Overcast conditions reduce glare.
Spotting tips
- Look near seagrass beds in shallow lagoons
- Early morning offers clearest water visibility
- Stay in one spot and let turtles come to you
- Polarized sunglasses cut water glare
- Listen for the sound of movement in the water
Accessibility
Requires water-based access; best viewed while snorkeling or from a ferry/boat. Not visible from shore without entering the water.
With kids
Perfect for snorkeling families! Sea turtles are non-aggressive. Teach children never to touch or chase them—explain they are protected by law and that contact causes stress. Excellent educational opportunity about marine conservation.
📷 Photographing them
Best vantage points
Little Africa Patch Reef during calm morning conditions; bring polarized lenses to reduce water surface glare and improve visibility.
Bring
Snorkel gear (mask, snorkel, fins), reef-safe sunscreen, polarized sunglasses, underwater camera if desired, binoculars (boat-based viewing)
Shoot ethically
Approach slowly and deliberately. Never chase or cut off the turtle's path. Maintain 25-yard distance at all times. Allow the turtle to move away naturally. Silent observation only—no splashing or noise.
🔭 Gear that helps you spot them
🌲 Natural history
- Migration
- Long-distance migration between tropical feeding grounds and natal nesting beaches, often separated by thousands of miles. Some individuals show high site fidelity to specific lagoons and reefs.
- Winter
- No hibernation. Green sea turtles remain active year-round in tropical waters.
🌍 Conservation
Threats
Marine pollution and microplastics, entanglement in fishing nets, coastal habitat loss at nesting beaches, climate change, illegal egg collection in some regions.
Protection efforts
Federal protections under the Endangered Species Act and Marine Mammal Protection Act. Illegal to harm, harass, or collect. Park staff monitor nesting and feeding areas; visitor education enforces distance rules.
How visitors help
Maintain distance and never touch. Use reef-safe sunscreen to protect corals and seagrass. Report sightings to help park research. Remove any marine trash. Follow all federal marine protection regulations.
Report sightings
Report sightings, photos, or injured turtles to Dock House and Information center or ferry staff. Include date, time, specific location (e.g., Little Africa), and behavior observed.
❓ Questions people ask
Will a green sea turtle bite me?
No. Green sea turtles are gentle herbivores with zero interest in humans. They only bite if grabbed or threatened. Never touch one, and you're completely safe.
Can I ride or touch a sea turtle?
Absolutely not—it's illegal and harmful. Touching damages their protective shell coating, causes stress, and disrupts feeding. Keep 25 yards back always.
How long do green sea turtles live?
Up to 90 years in the wild, making them among the longest-lived reptiles. A turtle you spot today might have been swimming these waters for decades.
Why are they called 'green' if their shell isn't green?
The name comes from greenish-colored fat beneath the carapace, not shell color. Their shells are typically olive or black.
Are green sea turtles endangered?
They were listed as Endangered until 2025 and remain federally protected. Global conservation efforts are helping populations recover, but they're still vulnerable.
When is the best time to see them?
Year-round in Dry Tortugas' warm tropical waters. Warmer months (May-October) may offer more frequent sightings, but they're present throughout the year.
