Remember that everything God does is motivated by his purpose, and therefore the original purpose for a product determines its design, composition, capacity, and potential. Purpose may be defined as "original intent" or "reason for creation." For example, God created seeds to produce trees and plants, and therefore they naturally posses the inherent abilities and capacities to perform this purpose. Fish were created to swim, and thus their ability and capacity to swim is inherent in their design and instincts. They never need to attend swimming school.
Birds, on the other hand, were created for the purpose of flight and naturally come with the inherent design and ability to fulfill that purpose. Birds never attend flight school. The principle is that whatever the Creator established as the original purpose for his creation determined its natural, inherent design, its raw material, and its capacity, capability, natural talents, and potential.