![Erin Dillon on Twitter: "1) How abundant were sharks on coral reefs before humans? Coastal #shark populations are depleted in many regions today, but long-term survey data are limited. Shark scales (dermal Erin Dillon on Twitter: "1) How abundant were sharks on coral reefs before humans? Coastal #shark populations are depleted in many regions today, but long-term survey data are limited. Shark scales (dermal](https://pbs.twimg.com/media/EmEsg9QU8AAxWKK.jpg:large)
Erin Dillon on Twitter: "1) How abundant were sharks on coral reefs before humans? Coastal #shark populations are depleted in many regions today, but long-term survey data are limited. Shark scales (dermal
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These Tiny Scales Make Sharks Incredibly Fast. Can They Help Us Build Better Planes? | National Geographic
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