Artificial light at night can change the behavior of all animals, not just humans

Watch India's new rocket launch for the 1st time Saturday night

While scientists have assessed the status of more than 147,000 plant & animals, there are thousands of species considered too "data deficient" for a full assessment. As a result, those species haven't been included in the listing of threatened or endangered species, updated each year by IUCN.

Early humans may have wiped out many turtles millions of years ago