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"Additionally, developmental changes suggest that vertebral anatomy shifts across development to support a larger body and caudal fin."

"They work in tandem to utilize the reverse-Kármán vortex street and adjust their caudal fins accordingly."

They swam by my mom like a fleet of small ships moving through the wreck, their sandy-brown skin gliding past her, caudal fins rippling like fabric through the water.

Thresher sharks are known as quick swimmers with small mouths, long caudal fins and timid dispositions, according to the Florida Museum of Natural History.

“It’s sort of unreal, when you come around the corner,” he said, looking skyward toward the caudal fin.