A herd of migratory impalas. They meet a large river. That is a big obstacle for them.
Not only that, in the river there are many crocodiles swimming and waiting for their prey to jump down. Herds of impalas ran back and forth hesitantly across the river.

But the impala still had to jump into the river to swim across. There are dozens of crocodiles swimming in the river waiting for the impala to jump.

The impala tried to choose places where there were no crocodiles to jump down and swim quickly over. But the crocodiles are too fast. The impala is small. Any impala that jumps down is immediately bitten by a crocodile. Crocodiles compete with each other to grab their prey.

They tore and devoured impalas.
The crocodiles seem to be very hungry. Whenever they see an impala jumping down, they immediately rush to grab their prey and swallow it whole.

Only a few lucky impalas escaped the crocodiles and swam to the other shore. The rest of them died while swimming across the river because they were eaten by crocodiles.

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