The mid-Cretaceous was one of the warmest period in the past 140 million years, with temperatures in the tropics as high as 35 degrees Celsius and sea level 170 metres higher than today with average temperatures around 12 degrees Celsius and that there was unlikely to be an ice cap at the South Pole.
Little was known about the environment south of the Antarctic Circle at this time. Researchers have discovered evidence of a temperate rainforest in the region. This was despite a four-month polar night, meaning for a third of every year there was no life-giving sunlight at all.
The evidence for the Antarctic forest comes from a core of sediment drilled into the seabed. Check out the video for the unique colors that tipped them off.
Despite being publish on April 1st, I do not think this is an April Fools joke.
https://phys.org/news/2020-04-ancient-rainforest-antarctica-warmer-prehistoric.html