World Register of Marine Species — Selachii
The taxonomic backbone for the complete living shark directory: accepted names, authorities, orders, families and Aphia identifiers. Snapshot accessed August 15, 2026.
NOAA Fisheries — White Shark
Size, lifespan, biology and U.S. management background.
NOAA Ocean Service — Greenland Shark
Longevity estimate and radiocarbon-dating context.
Florida Museum — Bull Shark
Reported maximum size, maturity and lifespan synthesis.
Florida Museum — Tiger Shark
Typical and exceptional size ranges.
Florida Museum — Great Hammerhead
Reported size, weight and expected lifespan.
NOAA Fisheries — 12 Shark Facts
Whale shark size context.
Wroe et al. (2008) — Journal of Zoology
Three-dimensional modeling of white-shark jaw mechanics and bite-force estimates for white shark and megalodon.
Habegger et al. (2012) — Zoology
Theoretical bull-shark bite force across a measured growth series, including the importance of bite position and animal size.
Cooper et al. (2020) — Scientific Reports
A two-dimensional reconstruction of megalodon body proportions using five living lamniform analogues.
Shimada et al. (2020) — Historical Biology
Lamniform body-size evolution and evidence-based limits for megalodon length estimates.
Shimada (2002) — Journal of Fossil Research
Species- and jaw-position-specific relationships between white-shark tooth crown height and total body length.
Cooper et al. (2023) — Journal of Fish Biology
Review and testing of shark dental characters as proxies for body size, diet and ecology.
Florida Museum — Discover Fishes
Authoritative dentition descriptions used in the shark tooth identifier's living-species profiles.
Towner et al. — Ecology
Direct observations of killer whales hunting white sharks in Mossel Bay, South Africa.
Towner et al. — African Journal of Marine Science
Evidence connecting killer-whale presence with white-shark absence from former aggregation sites.
Nielsen et al. — Science
The eye-lens radiocarbon study behind Greenland shark longevity estimates.
Heupel & Simpfendorfer — PLOS ONE
Environmental conditions associated with juvenile bull-shark habitat use.
U.S. Army Corps of Engineers — CSSC Dispersal Barriers
The engineered aquatic connection and fish barriers between the Mississippi basin and Lake Michigan.
Smithsonian Ocean — Sharks
Shark anatomy, gill ventilation, electroreception, evolution and ecological diversity.
NOAA Ocean Service — Do Sharks Hunt People?
Authoritative context on shark diets and interactions with people.
NOAA Fisheries — Sharpen Your Shark Facts
Accessible explanations of shark reproduction, dermal denticles and sensory biology.
NOAA Ocean Service — Ocean facts and tutorials
Authoritative explainers for tides, waves, currents, salinity, coral reefs, coastal habitats, marine debris and sea-level change.
NOAA Ocean Exploration
Deep-ocean pressure, trenches, hydrothermal vents, marine life and exploration methods.
NASA Earth Observatory — Phytoplankton
Ocean photosynthesis, food webs, oxygen production and the biological carbon pump.
U.S. EPA — Hypoxia 101
Nutrient loading, decomposition, stratification and low-oxygen coastal dead zones.
NOAA Physical Sciences Laboratory — Marine Heatwaves
Definitions, monitoring methods and physical drivers of extreme ocean-temperature events.
Verification note
Species biology varies by population, sex, age and study method. TuffShark records the wording and limitations of its source instead of silently converting uncertain ranges into exact facts.