
WWF fights to conserve the planet. WSPA fights animal cruelty.
WWF is a conservation organisation and while they are obvious work with pandas and other animals like dolphins, orangutans and tigers they focus on the protection of the species through habitat conservation and tackling illegal trading and hunting of endangered animals.
WSPA are an animal welfare organisation and they too are concerned with animals but their programmes focus more on the fact that animals have sentience and feel pain so must be treated humanely at all times in areas like farming and stray control.
WSPA also work against issues of animal cruelty like bear dancing and bear baiting, whaling, dog meat and the use of bear bile in Chinese medicine.