, National Parks are a method of in situ (on site) conservation, where endangered species are protected within their natural habitat . Ex situ (off site) conservation involves removing threatened animals and plants from their natural habitat to be protected and given special care in settings such as zoological parks or botanical gardens . The sources explicitly list cryopreservation of gametes, in vitro fertilization of eggs, and plant propagation via tissue culture (referred to as micropropagation) as advanced methods of ex situ conservation .