Bilateral Symmetry, A body plan that can be split into identical left and right halves., Homeothermal, Warm-blooded animals that keep a steady internal temperature., Poikilothermal, Cold-blooded animals whose temperature changes with the weather., Monotremes, Mammals that reproduce by laying eggs instead of giving birth., Keel, The bird breastbone where powerful flight muscles anchor., Amnion, The fluid sac inside a reptile egg that stops it from drying out., Metamorphosis, The biological transformation from an aquatic tadpole to a land adult., Lateral Line System, The sensory line fish use to feel water vibrations., Operculum, The protective bony flap covering a fish's gills., Cartilaginous Fish, The group containing sharks and rays because they lack true bones.

Vertebrates

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