The white anteater, known as Alvin, was first spotted late last year clinging to his mother's back.
Based on reported sightings, some scientists say the iconic creature probably survived until the late 1980s or 1990s, but others are skeptical.
The known population of the Yangtze giant softshell turtle is now just two males. Experts said that if the female had survived, she could have "laid a hundred eggs or more a year."
The beheading, which may have been motivated by a recent spate of crocodile attacks on humans, could spell trouble for the local ecosystem.
Brown widow spiders, which are invasive to North America, are wiping out black widow populations in the U.S. by aggressively attacking them for no clear reason, a new study shows.
Researchers accidentally discovered that GPS-tagged mammals can help locate Florida's invasive Burmese pythons, which are destroying local ecosystems.
A report from the conservation group NatureServe warns that 40% of animals and 34% of plants in the U.S. are "at risk" of extinction.
What animal species will survive projected future droughts, rising temperatures and habitat loss?
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