REGENERATION. “By contrast, some animals, such as zebrafish, can restore normal organ (heart) function after severe injury, and a few species of animals, such as some marine clonal invertebrates (e.g. many cnidarians), can even regenerate their entire body as a result of their modular development, a trait shared with plants.”
http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2010.03360.x/full