Fossil expands ancient fish family tree

A second ancient lungfish has been discovered in Africa, adding another piece to the jigsaw of evolving aquatic life forms more than 400 million years ago.

How one gene in a tiny fish may alter an aquatic ecosystem

In a remote area of British Columbia's Vancouver Island, Kennedy Lake's deep blue waters stretch over 25 square miles. The lake is home to the threespine stickleback, a diminutive fish species that has provided rich fodder ...

Imperiled, some freshwater mussels endure. How?

Freshwater mussels are among the most imperiled animals in North America, yet some colonies have managed to persevere despite habitat loss, pollution and other threats.

Report: Wildlife populations halved on average since '70s

Global wildlife populations have fallen an average of 58 percent from 1970 levels, with human activity reducing the numbers of elephants in Tanzania, maned wolves in Brazil, salamanders in the United States and orcas in the ...

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