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Limbs - (usually 4) in 2 pairs with associated shoulder and hip girdle Each limb usually has 4 digits. Hind limb (sometimes 5) Skeleton mostly boney Ectothermic (cold blooded) Smooth moist + glandular skin modified for cutaneous respiration (breathe through skin) Pigment cells (also called chromatophores) Mouth is usually large with small teeth in the upper or both jaws and on the vulgar (2 teeth sets on roof of mouth) palate 3 part brain: fore brain midbrain Hindbrain Ear with a tympanic membrane and stapes (ear bones) Have eyelids Lachrymal glands that protect and wash the eye Separate sexes mostly external fertilization. Respiration by the skin, gills, and lungs All amphibians go through metamorphosis A heart with 2 atria, 1 ventricle, and double circulation Skin abundantly supplied with blood vessels | Quizalize