Large scale animal migrations were once common around the world , but many have now
collapsed, and others face serious decline (Bolgeretal.,2008; Harris etal.,2009). For example , on the
Great Plains of North America , the American bison once numbered as many as 30 million animals;
Today only few remnants remain due to over-hunting (Bolgeretal.,2008). In Central Asia , the Saiga
Antelope has declined from over 1 million animals in 1980 to less than 200,000 in 2000 (Milner-
Gulland etal.,2001). In Kenya , the migration of vast herds of zebra and Thomson’s gazelle between
The Lake Nakuru- Elementaita region and the Lake Baringo disappeared in the early part of the 20 th
Century due to over-hunting , habitat loss and other human disturbances
Large scale animal migrations were once common around the world , but many have nowcollapsed, and others face serious decline (Bolgeretal.,2008; Harris etal.,2009). For example , on theGreat Plains of North America , the American bison once numbered as many as 30 million animals;Today only few remnants remain due to over-hunting (Bolgeretal.,2008). In Central Asia , the SaigaAntelope has declined from over 1 million animals in 1980 to less than 200,000 in 2000 (Milner-Gulland etal.,2001). In Kenya , the migration of vast herds of zebra and Thomson’s gazelle betweenThe Lake Nakuru- Elementaita region and the Lake Baringo disappeared in the early part of the 20 th Century due to over-hunting , habitat loss and other human disturbances
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