Flamingo are found by the million in Kenya. They are attracted by the proliferation of algae and crustaceans which thrive in the soda lakes of Baringo, Bogoria, Nakuru and Magadi in the Rift Valley, and Lake Natron across the border in Tanzania.
There are always some birds at each lake but large concentrations seem to move capriciously from one to another over a period of years. Lake Nakuru is the current hot spot but this may well change. It is thought that the changing water levels may be one reason why they change locations. Whatever lake they are presently at, the best time of the year for flamingo viewing is in January-February when they form huge pink masses around the shores of the lakes.
Flamingos have a complicated and sophisticated system for filtering the foodstuffs out of the water. This is because the highly alkane water would be toxic if consumed in large quantities. The deep-pink lesser flamingo, Phoenicopterus minor, filters algae and diatoms out of the water by vigorous suction and expulsion of the water in and out of its beak several times per second. The minute particles are caught on fine hairlike protrusions which line the inside of the mandibles. This is all done with the bill upside down in the water. The suction is created by the movement of the thick and fleshy tongue which lies in a groove in the lower mandible and works to and fro like a piston. Where the Phoenicopterus minor obtains its food largely by sweeping its head to and fro and filtering the water, the greater flamingo, or Phoenicopterus ruber, is more a bottom feeder and supplements its algae diet with small molluscs, crustaceans and other organic particles from the mud. It has been estimated that one million lesser flamingo consume over 180 tons of algae and diatoms daily!