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Thousands of wildebeests tumble from the top of a bank as they make a dramatic attempt to cross a river.

The shocking footage sees the big beasts jump 20ft as they make their way across the Mara River in Kenya.

Some lose their footing and break their backs and legs as they fall onto the hard ground – but luckily most make it to the other side unscathed.

Those who don’t survive are fed on by hungry crocodiles waiting for an easy meal.

Wildlife photographer Robyn Preston, 59, from New Zealand, says, ‘It was horrifying watching the wildebeest falling to the bottom.

‘Some fell into the river and were either swept away or made it to a sandbank in the middle. From there they were unable to move without crawling along on their front limbs.’

Wildebeests make the migration every year across the river to the grasslands of the Maasai Mara.

Normally they choose an easier crossing – but the sheer number of animals forced the migration across the river at this point.

‘My driver has been in the safari business for many years and said he had never seen anything like it before either,’ says Robyn.

‘One croc came up and grabbed a calf that had made its way to the sandbank in the middle. It was injured and had no way of escaping the croc’s jaws.

‘The calf was still half in the water so was an easy meal. The crocodile dragged it away and drowned it.

Watch the video to see nature at its rawest.