Axolotl

https://faunafocus.com/home/november-2017/#jp-carousel-5099

Because they are neotenic, adult axolotls retain the feathery external gills and finned tails from their juvenile stages.

Because they are neotenic, adult axolotls retain the feathery external gills and finned tails from their juvenile stages. These physical traits are suited to an aquatic lifestyle and are used for swimming.

Sources: (Brunst, January 1955; Griffiths, Bride, et al., 2004; Majchrzak, 2004)
Image: Josh More

 

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