and some of the land has been sold to farmers. Houses, cultivated plots, schools, shops, and bars are found on the Kitengela plains. Some of the park's revenues have been used for community projects in order for the people living on the Kitengela to benefit from the presence of the national park. Many Maasai landowners have formed the Kitengela Landowners Association, which works with the Kenyan Wildlife Service to both protect the wildlife and find benefits for the locals. The park and the Athi-Kapiti Plains are linked by the migrations of wild herbivore populations. The plains to the south of the park are important feeding areas during the wet season. Before the city was established, herds of animals followed the rains and moved across the plains from Mount Kilimanjaro to Mount Kenya, a migration as great as the migration that takes place on the Serengeti. However, as the city grew the park became the northernmost limit of the animal's migration. Migrating animals can reach their southern pastures by travelling through the part of the Athi plains called the Kitengela. This land is very important to their migration routes, but growth in the human population and the accompanying need for land threaten to cut off this traditional migration route from the park to land further south. The park's migratory species are also threatened by changing settlement patterns, fencing, and their closeness to Nairobi and other industrial towns. These activities fragment their ecosystems and occupy their habitat. Since 2005, the protected area is considered a Lion Conservation Unit. Tourism and education Nairobi National Park is the main tourist attraction for visitors to Nairobi. Visitor attractions include the park's diverse bird species, cheetah, hyena, leopard, and lion. Other attractions are the wildebeest and zebra migrations in July and August, the Ivory Burning Site Monument, and the Nairobi Safari Walk and animal orphanage. Inhabitants of Nairobi visit the park and thousands of Kenyan children on school field trips visit the park each week. The park's Wildlife Conservation Education Centre has lectures and video shows about wildlife and guided tours of the park and animal orphanage. These tours are primarily, but not exclusively, to educate schools and local communities. There has been criticism about animals' housing, and they now have more spacious housing in a more natural environment. The Kenya Wildlife Service has created a Safari Walk that highlights the variety of plants and animals