Are humming birds and fish regulators or conformers ? Give reasons in support of your answer.

A conformer depends upon the changes in the external environment, whereas a regulator controls their internal environment regardless of change in external environmental.

Humming bird is a regulator because they regulate their body temperatures and eats every several minutes because this regulation involves expenditure of energy.

While a fish is a conformer because in aquatic animals the osmotic concentration of fluids in the body changes with the external environment's osmotic gradient and temperature.