zoological science - the branch of biology that studies animalssiphon, syphon - a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled hood - (zoology) an expandable part or marking that resembles a hood on the head or neck of an animal plastron - (zoology) the part of a turtle's shell forming its underside collar - (zoology) an encircling band or marking around the neck of any animal pallium, mantle - (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell cloaca - (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open ethology - the branch of zoology that studies the behavior of animals in their natural habitats herpetology - the branch of zoology concerned with reptiles and amphibians ichthyology - the branch of zoology that studies fishes malacology - the branch of zoology that studies the structure and behavior of mollusks mammalogy - the branch of zoology that studies mammals oology - the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number) protozoology - the branch of zoology that studies protozoans aestivation, estivation - (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period vagile - having freedom to move about; "vagile aquatic animals" univalve - used of mollusks, especially gastropods, as snails etc. vertebrate - having a backbone or spinal column; "fishes and amphibians and reptiles and birds and mammals are verbetrate animals" invertebrate, spineless - lacking a backbone or spinal column; "worms are an example of invertebrate animals" ovoviviparous - producing living young from eggs that hatch within the body warm-blooded - having warm blood (in animals whose body temperature is internally regulated) cold-blooded - having cold blood (in animals whose body temperature is not internally regulated) ambulacral - pertaining to the ambulacra of radial echinoderms anguine - of or related to or resembling a snake annelid, annelidan - relating to or belonging to or characteristic of any worms of the phylum Annelida |