Eating Shark, Octopus, Rabbit And Duck
Shark is a predator so it is Haram. Not sure about octopus, if it humts like a predator it is haram too. Other animals listed here are not predictors so are halal. Predators means beastlike animals which kills their prey like a beast. Other fish and chicken too eat other fish and insecta but not in a beastlike way. So they are not predators and not Haram.