アニマルプラネットのインスタグラム(animalplanet) - 10月1日 01時00分

Oceans | Stingray's teeth are actually modified scales that they shed and regrow frequently. Because their teeth are constantly re-growing, they sometimes change depending on the season. For example, during mating season, a male’s teeth can completely morph to be sharper and then return back to normal once it ends. Stingrays also breathe through openings just behind their eyes and through their mouths.
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