what are some fauna found here?
Phalanger or grey cuscus, bats, rodents and estuarine crocodiles
Guadalcanal
The island hosts a native marsupial known as the phalanger or grey cuscus, "Phalanger orientalis". The only other mammals are bats and rodents. 

There are many species of colourful parrots as well as estuarine crocodiles.
what is guadalcanal campaign? A military campaign on and around the island of Guadalcanal in the Pacific theater of World War II where is this mentioned island located? Guadalcanal Province of the Solomon Islands, located in the south-western Pacific, northeast of Australia
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Guadalcanal [SEP] Fauna
The island hosts a native marsupial known as the phalanger or grey cuscus, "Phalanger orientalis". The only other mammals are bats and rodents. There are many species of colourful parrots as well as estuarine crocodiles. In recent times, these crocodiles have been found only on the Weather Coast in the south of the island, but during the Second World War, they were found along the north coast in the vicinity of the airstrip where the fighting was taking place, as evidenced by names such as Alligator Creek. Venomous snakes are rare on the island and are not considered to be a serious threat; however, there is a kind of centipede that has a particularly nasty bite.