Practice question

Toads typically differ from frogs within Anura family Bufonidae via dry rough thickened keratinized skin heavily tuberculated with warty protuberances and prominent paired parotoid glands behind eyes secreting milky bufotoxins steroidal alkaloids providing chemical defence, adaptation reducing evaporative water loss reflecting more terrestrial habit away from permanent water. Legs relatively short suited for walking rather than prolonged jumping, extensive webbing reduced. Frogs generally possess smooth moist thin highly vascular skin favoring cutaneous respiration, long hindlimbs for saltation, extensive webbing supporting swimming and aquatic activity distinction.