The migrating herds spend roughly 3 to 31/2 months in the Mara crossing through Sand River, which is a tributary of the Mara along the boundary of Kenya and Tanzania. They trek westwards and cross the Mara river and sometimes the Talek river. Usually around this time heavy rains on the Mau Escarpment (origin of Mara River) fill the Mara river to the brim.

This is a good time to watch the trunk-looking Crocodiles, while they await the forthcoming feast.
Finally, the gnus (wildebeests) venture into the river. This gregarious coordinated behavior of the herds, usually teamed with zebras, creates an unimaginable scene. Just what the cameras have been waiting for.

They wander along the river looking for a convenient crossing point. This is a moment filled with tension for both the gnus(wildebeests) and the audience. They survey for a less steep and with no obvious danger. Finally, one takes courage and plunges into the river and magically the rest falls onto the footsteps and in one organized line cross the river.

In addition to the crocodiles, accidents also occur. The river’s current can be too strong for some especially the young ones. Or simply getting stuck between the rocks in the river and breaking limbs, a direct ticket to the jaws of the giant crocodiles. Finally, the crossing is done and the trek to their unknown (or known)destiny continues.

In the month of October, they are already heading to Serengeti where the rains have treated the southern grasslands to lush, green carpet of rich grass. Once again, they are heading to the southern plains, where a new generation will be born to start the cycle of life all over again.