With a high-speed camera and vibrometer in his toolkit, researcher Damian Elias, featured in Part Two of “What Females Want and Males Will Do,” is able to pick up on a courtship ritual few have ever seen before. He’s discovered that male jumping spiders actually perform an elaborate dance — with coordinated vibrations, no less — to woo potential partners. Part of the 26th season of the Peabody and Emmy award-winning series produced by Thirteen/WNET New York for PBS, “What Females Want and Males Will Do” premieres over two Sundays, April 6 and 13, 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/nature