Frog of the Week

Holdridge’s Toad (Incilius holdridgei)

Holdridge's Toad
photo by Juan G. Abarca

Common Name: Holdridge’s Toad
Scientific Name: Incilius holdridgei
Family: Bufonidae – True Toad family
Locations: Costa Rica
Size: 1.25 – 2 inches (32 – 53 mm)

The Holdridge’s Toad lives in the secondary montane forest of Costa Rica. They are an explosive breeder following the rains in April. Interestingly, the toad lacks vocal slits, making it impossible for the frog to call. The toads breed in forest pools filled by the recent rains and man-made ditches. Females lay between 45 to 137 eggs. The tadpoles take around a month to complete their metamorphosis.

Holdridge's Toad
photo by Juan G. Abarca

The International Union for the Conservation of Nature (IUCN) Red List assesses the Holdridge’s Toad as Critically Endangered. The toad was thought be extinct until it was spotted in 2009. The habitat of the toad has not been that distrubed, leading reasearchers to believe that Chytrid Fungus, a deadly fungal disease, wiped out most of their population. There is thought to be less than 50 total mature toads left. Luckily, the toads habitat falls into a protected area but researchers haven’t been able to captive bred the toad.

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