“According to the dealer, several people in the village collect these crayfish for the pet trade,” the study said. “After collection, they are kept for several days in cages in the river before the ...

Far from its home in Indonesia, a brightly colored creature moved around in an aquarium. Scientists peered into the tank, studying their pet-turned-specimen — and discovered it was a new species.

Around the world, animals remain hidden and undiscovered in thick forests, rocky rivers and the depths of the ocean. In some cases, it can take decades of searching through treacherous conditions ...