Banded Bullfrog

Fascinating facts about the Banded Bullfrog

• When the monsoon finally breaks, male banded bullfrogs unleash a chorus of 28–56 pulses per second, each call sweeping from 50 to 1,760 Hz, turning quiet rain-filled ponds into a rapid-fire soundtrack that guarantees mates are ready the moment water appears.
• A newborn tadpole measures about 0.5 cm, and it reaches roughly 1.1 cm at the end of metamorphosis; metamorphosis begins around two weeks after hatching.
• Weighing only 80–120 g, the frog can puff its lungs to look larger than its 5.4–7.5 cm body, then secrete a white, trypsin-inhibiting foam that ruptures red blood cells, an effective, non-lethal surprise that lets it escape snakes and other predators.
• Surveys of online listings from 2015–2018 showed three to four times more offers than requests for banded bullfrogs.
• Because they can burrow several inches underground during dry spells, these frogs survive prolonged droughts and reappear after heavy rain, a strategy that has helped them spread from sea level up to 750 m across Southeast Asia and even colonize distant islands like Guam and Borneo.

At a glance

About the Banded Bullfrog

The banded bullfrog, Kaloula pulchra, is a compact amphibian whose stocky, triangular body is cloaked in a dark brown back streaked with copper-brown to salmon-pink bands, while its belly remains a soft cream. Adults range from 5.4 to 7.5 cm in length and weigh 80–120 g, with males slightly smaller than females. Their short snout and modest limbs betray a life built for digging rather than leaping; when threatened they puff up their lungs and exude a white, trypsin-inhibiting secretion that, while non-toxic, can cause hemolysis in predators. In the low-lying forests, farms, and bustling cities of Southeast Asia, from northeastern India and Nepal to the islands of Borneo and Sulawesi, these frogs spend the dry season burrowed underground, emerging only after monsoon rains to call from rain-filled pools. Their calls, a rapid series of 28–56 pulses per second in India and a dominant 250 Hz tone in Thailand, announce a brief breeding frenzy. By night they hunt ants, termites, and other small invertebrates, snapping prey shut in a 150-millisecond tongue flick. A surprising twist to their ecology is their occasional arboreal forays, where they have been spotted scaling trees to pursue termites, revealing a versatility that belies their reputation as ground-bound burrowers.

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