The Wrights' home became internationally renowned for its easy access to wildlife, especially the oilbird ("Steatornis caripensis") colonies in the nearby Dunston Cave. The Asa Wright Nature Center was established on 22 Dec. 1967, with the Royal Bank Trust Company (Trinidad) Limited appointed as Trustee. The Trust was meant to protect Springhill "in perpetuity", developing its agriculture in an "ecologically sound" way while facilitating its "scientific and educational" potential. Asa was allowed to live out the remaining years of her life according to a provision in agreement. She died in 1971. In 1974, the New York Zoological Society donated Simla to the trust.