Off the west coast of Peru, seabirds deposit thick layers of guano that accumulates on the ground because of the lack of rain. Guano has historically played a key role in agriculture worldwide because it is rich in plant nutrients such as nitrogen and phosphorous. Now, researchers revealed the effects of guano on the native trees of the arid coasts of South America. Researchers found that non-nitrogen fixing trees become more abundant closer to sea replacing the usually more abundant nitrogen fixing trees in these deserts....