Reptile · GBIF taxon 2443074
Northern Map Turtle
Graptemys geographicaAlso known as Common Map Turtle
Northern Map Turtles feature intricate, map-like yellow contours across their olive carapaces that act as natural camouflage in weed-choked rivers and lakes. Adult females grow significantly larger than males, developing broad heads and powerful jaw surfaces adapted for crushing heavy-shelled prey like snails and mussels. Extremely skittish by nature, these aquatic reptiles spend sunny mornings basking on fallen logs but slip silently into deep water at the first sound of approach.
AquaticReptileBasking
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Diet & prey
- Freshwater Snails
- Crayfish
- Mussels
Predators
- Raccoons
- Skunks
- Herons
ThreatsHabitat destruction, boat strikes, shoreline development, and nest predation
HabitatsLarge rivers, lakes, reservoirs, and slow-moving streams
Life span20 to 30 years
Size / weightNot available
Classification
- FamilyEmydidae
- SpeciesGraptemys geographica
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- May deliver a strong bite if handled; observe quietly from shoreline or boat.
- Why it is dangerous
- Adult females possess broad, muscular jaws designed for crushing hard mollusk shells, which can inflict a painful bite if grabbed.
- How to recognize a risky encounter
- Look for fine, map-like yellow lines covering the olive carapace and skin, with a distinct pale spot behind each eye.
- What to do
- Observe from a respectful distance without attempting to lift or handle turtles basking on logs or nesting along beaches.
- What to notice
- Recognized by high-domed olive shells covered in intricate yellow network patterns reminiscent of a topographic map.
- Support conservation
- Give nesting females wide berth on sandy beaches during late spring and early summer.
Responsible observation
- Shoreline Observation: Use binoculars to scan sunlit logs along riverbanks, as they drop into the water at the slightest disturbance.
- Boating Safety: Slow down in shallow vegetated bays to avoid propeller strikes on surfacing turtles.
- Handling Caution: Avoid picking up wild individuals, as female jaws are strong enough to crush hard shells.
Frequent Companion MH Herpetology / CC BY-SA 4.0 · cc-by-sa
Prey 
Close Relative (c) Charlotte Kirchner, some rights reserved (CC BY), uploaded by Charlotte Kirchner · cc-byClose Relative
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