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Any animal that hatches as a larva with gills to live in water and develops lungs as it matures to live on land
Claw of a bird of prey
Inborn tendency to behave in a certain way - passed on through heredity
Any of a class of coldblooded chordates that breathe through lungs and have dry, scaly skin and lay eggs on land
Warm-blooded animal with hair, the female of which has mammary glands producing milk to feed its young
State of suspended animation for many plants during part of the year
Simple animal of the phylum Porifera that lives at the bottom of the ocean
Hard, stony substance consisting of the skeletons of certain sea polyps that form reefs and atolls
Vascular organ in most mammals by which the developing young is attached to the wall of the uterus and receives food and oxygen
Phylum of invertebrates that includes corals and jellyfish - its name means 'hollow body cavity'
Any of a phylum of invertebrates with jointed legs and an exoskeleton
Marked change in the structure of an animal during its growth, as in the process by which a caterpillar becomes a butterfly
Animals with a central nerve similar to the human spinal cord
Any of an order of mammals with five fingers on each hand and five toes on each foot
Adjective describing any appendage adapted for seizing, grasping, and holding on, especially in reference to tails of monkeys
Principal nitrogenous waste of mammals and a chief component of urine
Any of a phylum of marine invertebrates usually with five arms and with rough, spiny skin
Any member of a phylum of animals having a soft, unsegmented body and a shell