Testudines sunt ectothermi—animalia vulgo poikilothermi appellata—quod significat eorum temperaturam internum cum temperatura ambiente variare. Corporea autem Dermochelytis coriaceae temperatura, propter eius altam proportionem metabolicam, aqua circumpatenti insigniter altior est. Testudines amniotaclassificantur, cum aliis reptilibus, avibus, et mammalibus. Aliorum amniotorum similes, aerem suspirant, et ova in aqua non pariunt, quamquam multae species in aut prope aquam habitant.
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