American bullfrogs may be threatening a rare frog species in Brazil
Signs of bullfrog DNA in the environment uncovered the previously hidden threat
![An American bullfrog peeks out of the water](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2024/03/031824_JL_bullfrog_feat.jpg?fit=1030%2C580&ssl=1)
The invasive American bullfrog (one shown) might be living not far from a critically endangered species of frog, Pithecopus rusticus, with only one known population in Brazil.
Kent Ross/iNaturalist (CC BY-NC 4.0 DEED)