Here we go back in time and remember 13 remarkable moments of 2013.

Unveiled: two extinct cave lions  - dug from the permafrost - make their first appearance since Pleistocene times.

Experts crack prehistoric mystery over extinct babies preserved in permafrost since Ice Age, and reveal the VERY surprising colour of this 'tigerlion' species.

Sensational find of  head of the beast with its brain intact, preserved since prehistoric times in permafrost.

Little cat is possible brother to ‘Boris’ found last year some 15 metres (50ft) away.

Exclusive pictures show autopsy on a four year old bison preserved in ice since ancient times.

The young beast's head was resting on a paw in frozen ground for up to 50,000 years, shows amazing first picture.

Pavel Yakovlev makes ‘great scientific discovery’ near his village in Yakutia.