It’s not a great time to be an endangered species in Brazil. The rate at which wildlife is dying off in fragments of rainforests in the South American nation is greater than previously thought.

Scientists visited 196 “fragments” of forest on the eastern, Atlantic coast of Brazil, and found (on average) only four of the 18 mammal species they were looking for. The problem is that those dozens and dozens of tiny bits of rainforest used to be one huge, cohesive environment where wildlife could roam free. It has been cut up and divided by roads, cities, farms, and other forms of deforestation.