Which wildlife conservation subscription model pioneered the 'adopt-a-nest' live camera monitoring system that revolutionized supporter engagement?

Conservation organizations have been pioneering innovative subscription models to fund their wildlife protection efforts. These models not only provide steady income for conservation projects but also create deeper engagement with supporters. Test your knowledge about how these subscription models have transformed wildlife conservation funding and awareness in recent years.

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World Wildlife Fund's 'Guardian' program
Cornell Lab of Ornithology's 'Bird Cam' membership
National Geographic's 'Wildlife Watch' subscription
Conservation International's 'Habitat Heroes' monthly plan