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Channel: The Why Files » Populations and ecosystems
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Odder than odd!

In the dark days of winter… We need a pick-me-up. Let’s take a guided tour of some amazing — and actually important — science results from the year just passed. What is the unseen levy of leaning? Who...

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A bad climate for endangered species?

Warming worries: Wolverine may get endangered status On Feb. 1, 2013, the U.S. Fish and Wildlife Service proposed adding the wolverine — a tough, reclusive carnivore that lives in the snow in the Rocky...

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Wolf mystery solved at last!

How did the wolf cross the ocean? It was a mystery of nature even before Charles Darwin reached the Falklands Islands in the South Atlantic: How did the Falklands Islands wolf, the only resident...

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Ancient water = ancient habitat?

Study uncorks possibility that ancient water supports ancient life Photo: J Telling Gas bubbles from briny water emerging from the floor of a deep mine. The water’s chemical composition could feed...

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Menace to monarchs

Menace to monarchs ENLARGE A monarch butterfly on milkweed. Monarchs are able to feed and lay eggs on milkweed, although the plant is toxic to most insects. Ingesting the chemistry of milkweed,...

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Flying south for the winter?

Flying south for the winter? ENLARGE A fixture of temperate meadows and marshes, the unmistakable red-winged blackbird also jet sets to warmer winter weather, reaching as far as Guatemala. Unlike many...

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Continental connection: North, South America linked much earlier than thought

Continental connection: North, South America linked much earlier than thought Panoramic view of the Cauca River canyon, Colombia, where rock layers contain crystals of zircon, sourced in the Panama arc...

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How climate drives bird migration

How climate drives bird migration Pine siskins, a species of seed-eating boreal bird, will spend some winters in the pine, spruce and fir forests of Canada, and then arrive at bird feeders much farther...

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Australian “dragon.” If it’s hot, eggs hatch with female genitalia but male...

Australian "dragon." If it's hot, eggs hatch with female genitalia but male genetics. ENLARGE The Australian central bearded dragon is widespread in the semi-arid open woodlands of eastern Australia....

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Tropical mountain diversity: species rise from below, but also travel from afar

Tropical mountain diversity: species rise from below, but also travel from afar ENLARGE Botanists Merlijn Jocqué (Rutgers University), Rachel Schwallier (Naturalis Biodiversity Center) and Sukaibin...

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