Frog Distribution Myth-Busting: They're Not on Every Continent Except Antarctica

The claim that "frogs live on all continents except Antarctica" is inaccurate. While frogs (order Anura) are remarkably widespread, their actual distribution has significant gaps—even beyond Antarctica.

Where Frogs Are Truly Absent

• Antarctica: Too cold, no liquid water, no insect prey — only Belgica antarctica (midge) among insects
• High Arctic islands: Greenland (only 1 species: Rana temporaria in far south), Svalbard, Franz Josef Land, Canadian Arctic Archipelago — essentially frog-free
• Oceanic islands without human introduction: Hawaii (no native frogs; coqui introduced), New Zealand (only 3 native Leiopelma species, no true frogs), many Pacific atolls
• Extreme deserts: Sahara core, Atacama, Rub' al Khali — no permanent water for reproduction
• High-elevation zones: Above ~5,000m (Himalaya, Andes, Rockies) — physiological limits

Native Gaps in "Frog-Rich" Continents

• South America: Patagonian steppe, high Andes, Atacama margins — frog-poor
• Africa: Sahara, Namib, Kalahari cores — only peripheries
• Australia: Central/western deserts — only 4 species in arid zone (burrowing frogs)

Why the Myth Persists

• Frogs inhabit 6 of 7 continents (absent only from Antarctica) — technically true at continental scale
• High species richness in tropics (Amazon, Congo, SE Asia) creates impression of ubiquity
• Human introductions (cane toad, bullfrog, coqui) fill many gaps artificially

Biogeographic Reality

Frogs require: (1) moisture for permeable skin, (2) aquatic/gelatinous egg deposition, (3) insect prey. These constraints exclude them from ~30% of Earth's land area. Their diversity peaks in warm, wet tropics (88% of 7,500+ species).

Climate Change Impact

Range shifts documented: upslope movements in tropics, northward in temperate zones, extinctions in mountaintop endemics (e.g., Atelopus harlequin frogs). Chytrid fungus (Batrachochytrium dendrobatidis) has caused 90+ extinctions—greatest disease-driven biodiversity loss recorded.

Accurate statement: "Frogs are native to every continent except Antarctica, but absent from large subregions including high Arctic, oceanic islands, extreme deserts, and high alpine zones."