African is a type of Person. Person is part of Nature. you are likely to find Snake in/at/on Nature. you are likely to find Snake in/at/on Field. 
Large is related to Cow. Cow can Pet. Fur can be used for Pet. 
African --IsA--> Person --PartOf--> Nature <--AtLocation-- Snake --AtLocation--> Field 
Large <--RelatedTo--> Cow --CapableOf--> Pet <--UsedFor-- Fur 