Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

Hundreds of monkeys can now safely cross roads in Alta Floresta, a city in the southern Brazilian Amazon. Seven canopy bridges have reconnected rainforest fragments that were separated by urban roads.

Source: Sofya Dolotovskaya, used with permission. Many birds and mammals are socially monogamous—males and females pair up, live together, and often raise their young together. However, once methods ...

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