Previously, scientists at Arizona State University and the Louisiana Department of Wildlife and Fisheries discovered that, like lizards, young lizards in the United States can regrow their tails up to more than 22 cm long. This new discovery could support research into human skin regeneration therapy, the team said.

And recently, scientists continue to discover that crocodiles can regrow their tails, making them the largest species on Earth that can regenerate severed limbs.

"Regrowth bone is surrounded by connective tissue and skin but no skeletal muscle," said Kenro Kusumi, co-author of the study.

Lizards have long been known to form new limbs that have been severed, but until this study it was unclear whether much larger reptiles had a similar capacity.

For the answer, Kusumi began the investigation after receiving a package in the mail containing a deformed crocodile tail in a jar of pickles with ethanol. The tail he received in 2017 really stands out because it is discolored, split and scaly smaller than usual.

Kusumi soon realizes that the tail looks like it has been regrown, and he and his team confirm that it is true. They also analyzed the regrowth tails of three other crocodiles for additional information.

Kusumi told CNN knowing that differently formed regenerative tails - without bone tissue - than initially, could play an important role in understanding how to develop regenerative therapies in humans.