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Extinction Countdown

Brazil Plans to Clone Its Endangered Species

black lion tamarin

If scientists in Brazil have their way, the populations of eight endangered species could soon expand through a mass effort to clone them. The project is spearheaded by the Brasilia Zoological Garden in partnership with Embrapa, the Brazilian government’s agricultural research agency. The scientists have already spent the past two years collecting 420 genetic samples [...]

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Extinction Countdown

First Purebred Bison Calf Born after Disease-Washing Embryo Transfer

Julie Larsen Maher 7867 American Bison and Calf BZ 07 04 12

What does a two-month-old bison calf in the Bronx have to do with the future of its species? Quite a lot, it turns out. After being slaughtered to near extinction in the 19th century, the American plains bison (Bison bison bison) has become a bit of a conservation success story, albeit with a few important [...]

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The Thoughtful Animal

Koalas and Bison Use the Same Rules for Choosing Mates


While natural selection works operates over an individual’s ability to survive, sexual selection operates over an individual’s ability to mate and successfully sire offspring. In other words, sexual selection is a process through which individuals of a given species struggle to be more reproductively successful. It works in two primary ways, first identified by Charles [...]

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