California Tree Frog

Fascinating facts about the California Tree Frog

• Its mottled grey and brown skin makes the frog look like a granitic stone, a camouflage that helps it blend with the bouldery streams it inhabits. The dorsal surface is roughened and warty, matching the texture of surrounding rocks, while the lighter ventral side remains hidden beneath. Adults measure between 2.9 and 5 cm from snout to vent, a size that lets them slip into narrow crevices.
• Genetic sampling of over 200 individuals points to the eastern end of the Transverse Ranges as the species' birthplace, indicating that this mountainous area seeded the lineage now found across southern California and Baja California. The study examined frogs collected from multiple of California's unique biomes, confirming the same origin across the range.
• DNA work shows the frog's genetic roots stretch back to the Pleistocene Epoch, meaning its lineage has persisted since that ice-age period. The research identified a genetic foundation dating to that era, demonstrating remarkable long-term survival despite climatic shifts.
• Although the California tree frog is listed as relatively common and not threatened, its eggs face a specific danger from ultraviolet light that can lower their chances of hatching. The IUCN assessment notes that there are no major threats aside from this UV exposure, which reduces embryonic survival. Habitat fragmentation is also mentioned as a possible risk that might limit genetic diversity across isolated populations.
• In the shallow ponds that form within stream channels, adult California tree frogs often fall prey to the invasive green sunfish. These non-native fish regularly consume the frogs, adding to the predation pressure already present from native rainbow trout and two-striped garter snakes. The frogs' preferred habitat of boulder-strewn streams provides some cover, but the presence of green sunfish still results in frequent adult losses.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

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