Ecology is a branch of biology concerned with the relations between organisms and their environment. Ecologists work to advance ecosystem research and improve knowledge to protect and restore the services of nature. "Ecosystem services" are the many life-sustaining benefits we receive from nature — clean air and water, fertile soil for crop production, pollination and flood control. These ecosystem services are important to our health and well-being, yet they are limited and often taken for granted as being free. (Source: WordNet, EPA / Photo: Flickr)

This 'king' once ruled the green, lush forests of Antarctica

In memory of species declared extinct in 2018 — plus one we've already lost in 2019

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Ecologists share their passion for nature in these winning images

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11 startling stats about Earth's disappearing wildlife

How biophilia can improve your life

How the fear of wolves benefits ecosystems

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13 amazing antics of ants

The surprising beauty and benefits of driftwood

(Un) Happy Earth Overshoot Day