What is the difference between pectoral fins and the dorsal fin?
Pectoral fins are curved back slightly and pointed at the tips. Dolphins use their pectoral flippers mainly to steer. Pectoral flippers have the major skeletal elements of the forelimbs of land mammals, but they are foreshortened and modified. The back fin is like the keel of a boat, that gives stability while they swim and unlike the pectoral fins this one does not have any bony structure, but woven connective fibrous, that gives its form and firmness.
