Fans of Isabella Rossellini's Green Porno will love Link Link Circus, her "from the waist up" follow-up at the Baryshnikov Arts Center.  So will animal lovers, TED Talk types and theatergoers with a sense of humor. Surrounded by her collection of wooden and wind-up childhood toys, Rossellini is the ringleader/lecturer (is there really any difference?) sharing her love and knowledge of animals.  Unlike certain celebrity activists, she practices what she preaches with an Master's Degree in Animal Behavior - hence the Link Link  - from Hunter College.  Then along with her honorary PhD from the University of Quebec at Montreal, she is