Greater Sailback

One of the Holocene's larger herbivores, the Greater Sailback is instantly recognizable by its elongated spines. It is believed to have been cold-blooded, so the "sail" would have allowed it to quickly warm up and become active in the morning and to just as easily cool off if it got too hot. Its long legs may have allowed the Sailback to wade deeply into lakes or rivers to reach plants its competitors couldn't get. Perhaps it even spent most of its life in the water...

Curiously, the Greater Sailback went extinct at about the same time a smaller relative's population exploded across nearly the entire globe.

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A loving tribute to our poor understanding of extinct life.
Guess the real identity!
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