One account said this was the worst animal welfare violation she'd ever seen.
Breeding endangered animals is part of a zoo's "species surival plan."
Despite legal protection, North Atlantic right whales keep getting struck accidentally by fishing boats and entangled in gear.
In the Russian Far East, scientists thought they had spotted a tiger flee shelter from the snow, possibly spooked by a much smaller female leopard sleeping inside.
The scientists hope they weren’t interrupting a courtship session.
The video was shot in November last year and has just been released after expert analysis.
Baculovirus forces its caterpillar host to climb up trees before it bursts out to infect others on the ground below.
Donald Trump may be cutting funding to the environmental sciences, but one near-endangered butterfly is thriving.
The animals are different to study as they live in harsh climates in politically unstable regions.
An analysis of lion teeth reveals why they attacked and ate dozens of railway workers 100 years ago.
The winter cold aggravates the giant mammals’ arthritis.
The African country says it needs to sell its ivory stockpile to raise money for conservation.
So think twice before chucking them in the blue bin.
Zolushka, released in 2013, is believed to be the first rehabilitated Siberian tiger to give birth in the wild.
The 72-year-old died on Tuesday from severe hypothermia.