All animal products contain fat. Some portions contain large amoounts of fat other portions contain less fat. Lard is 100 %, Butter is 100 % fat, fish and eggs contain small amounts of fat.
The are two different types of Unsaturated fat, Monounsaturates and Polyunsaturates. If the question is which foods contain little or no saturated fat, you'll probably find it difficult to find many...