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The Five C’s of Christian Courtship
Bird Courtship, Mating Dances, and Other Rituals
Sturgeon is the common name for the 27 species of fishes belonging to the family Acipenseridae. The earliest sturgeon fossils date to the Late Cretaceous , and are descended from other, earlier acipenseriform fish who date back to the Triassic period some to million years ago. Four species may now be extinct. Both sturgeons and paddlefish have been referred to as " primitive fishes " because their morphological characteristics have remained relatively unchanged since the earliest fossil record. Sturgeons are long-lived, late-maturing fishes with distinctive characteristics, such as a heterocercal caudal fin similar to those of sharks , and an elongated, spindle-like body that is smooth-skinned, scaleless, and armored with five lateral rows of bony plates called scutes. The largest sturgeon on record was a beluga female captured in the Volga estuary in , measuring 7. Most sturgeons are anadromous bottom-feeders , which migrate upstream to spawn, but spend most of their lives feeding in river deltas and estuaries.