hind limb 
Long powerful articulated member attached to the terminal end of the trunk; it has five webbed toes used for walking, jumping and swimming.
web
Fine membrane of skin connecting the digits of the foot; it stretches when the frog swims.
digit
Terminal end of the limbs formed of various articulated bones; it has neither nails nor claws.
forelimb
Short articulated member located behind the head; it has four digits and is used for walking.
lower eyelid
Thin muscular membrane that is translucent and movable; it rises from the lower edge of the eye to protect and cleanse it.
mouth
Anterior cavity of the digestive tract located on the ventral surface that allows food to be ingested.
nostril
External orifice of the nasal cavity located above the mouth and having olfactory and respiratory functions.
snout
Anterior round protruding portion of the head that forms the mouth and the nostrils.
eyeball
Protruding organ of sight contained in the bony cavity at the top of the head used to perceive light intensity, motion and shapes.
tympanum
Thin strong elastic membrane connected to the inner ear to capture acoustic vibrations.
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