Columbia subject headings:
Harvard subject headings:
Birds--Ecology--Galapagos Islands.
Birds--Evolution--Galapagos Islands.
Finches--Ecology--Galapagos Islands.
Finches--Ecology.
Finches--Evolution--Galapagos Islands.
Finches--Evolution.
Princeton subject headings:
Birds--Galapagos Islands--Ecology.
Birds--Galapagos Islands--Evolution.
Finches--Ecology.
Finches--Evolution.