Rare Theloderma Frogs Find a New Home at Primorsky Aquarium

A group of rare frogs, known for their extraordinary camouflage, now live at the Primorsky Aquarium in Vladivostok. These tiny creatures, called Theloderma or hole-in-the-tree frogs, measure just 1.5 to 4 centimetres long. Their ability to blend into moss, bark, and lichen makes them nearly invisible—even to experts. Theloderma frogs spend most of their time hidden in tree hollows, rock crevices, and damp organic cavities. Their rough, textured skin—covered in strange growths—mimics bark, lichen, or even bird droppings. This natural disguise is so effective that specialist Dmitry Serkov took two years to spot one species, despite knowing they were there. Even experienced observers sometimes search for a full year before catching sight of one.

Beyond camouflage, these frogs are skilled swimmers and agile climbers. They glide between branches using the webbing between their toes. The aquarium currently houses five species: the marbled, starry, Chuangxi, Vietnamese, and brick-red. Now, Theloderma frogs play a unique role in education. They are used exclusively in the project *Growing Up in the Aquarium* for one-on-one sessions with children.

The frogs’ presence at the aquarium offers a rare chance to study these elusive creatures up close. Their natural behaviours, from camouflage to climbing, provide valuable lessons for visitors. The educational project ensures that even the most hidden species can be observed and appreciated.