Lobsters

As lobsters grow, their hard shells become too small. in order to continue to grow, they split their shells and crawl out, naked and vulnerable. During the time it takes for their new shell to harden, they face danger without the protection of their shell.
When the new shell hardens it is too big, so it doesn't fit quite right. Eventually the lobster grows into her new shell and feels more comfortable, until she grows more and the cycle starts all over again! During its first year, a lobster molts fourteen to seventeen times, but when it grows older it molts not more than once a year.