Columbia subject headings:
Birds--Physiology.
Graafian follicle.
Ovaries.
Reptiles--Physiology.
Harvard subject headings:
Birds--Physiology
Graafian follicle
Ovaries
Reptiles--Physiology
Princeton subject headings:
Birds--Physiology.
Graafian follicle.
Ovaries.
Reptiles--Physiology.