SUMMARY OF MAIN POINTS:
• Over one million wildebeest migrate in search of greener pastures, accompanied by zebras.
• The Mara River presents a major obstacle, patrolled by crocodiles and requiring dangerous crossings down steep slopes.
• Zebras frequently lead the crossing, prompting the massive buildup and widening of the wildebeest formation.
• Successful animals flood the fields of the Mara in massive numbers.