I do not have to see the crocodiles under the water to know that they are there, yet year after year Wildebeest and zebra are attacked by crocodiles as they cross the Mara river <a href="http://www.telegraph.co.uk/earth/earthpicturegalleries/9492711/Wildebeest-and-zebra-are-attacked-by-crocodiles-as-they-cross-the-Mara-river.htmlsome">http://www.telegraph.co.uk/earth/earthpicturegalleries/9492711/Wildebeest-and-zebra-are-attacked-by-crocodiles-as-they-cross-the-Mara-river.htmlsome</a> wildebeasts and zebras make across the mara river but some do not that doe