Losing a head, or decapitation can often lead to death in many species. But some sea Slugs have the weird but powerful ability to grow a body out of their heads. Elysia cf. marginata sea Slugs are known to pull themselves free from their bodies and just keep crawling around while growing a new body. Nara Women’s University in Japan reported that few hours after pulling off from the body these Slugs started nibbling at algae again.
In 20 days, a third of the young sea slugs they watched had grown their bodies back, heart and all. When Nara’s Women University mentioned it, scientists said that this is the first time whole-body regeneration in any sea slug has been reported.
Other creatures can regenerate too. The planarians, the little cross-eyed flatworms, when minced into various pieces can regenerate from multiple cut pieces. However, planarians have simple body forms they do not have a heart.
There are other creatures like the tubelike sea squirts called ascidians. They might be considered the most complex of whole-body regenerators but they also lack hearts. This is the first time probably, that a creature with a heart is regenerating. Marine biologist Sónia Cruz at the University of Aveiro in Portugal said she has worked with Elysia species but has never found anything like this.
The scientists however warn though that the deheading maybe a way to fend against predators /parasites. It may be a voluntary decision or safety precaution on part of the Slugs. These Slugs have groove looped on the back of the head region that seems to work as a break-here zone, and it can help to easily dehead.