En masse, Cuban land crabs migrate to the sea, their ancestral home, to release their eggs into the water. Part of the 26th season of the Peabody and Emmy award-winning series produced by Thirteen/WNET New York for PBS, “Cuba: Wild Island of the Caribbean” airs Sunday, March 30 at 8 p.m. (check local listings). Major support provided by Canon U.S.A. Inc., Toyota, and the Corporation for Public Broadcasting. For more information, visit http://www.pbs.org/wnet/nature/cuba/