Keystone species mussel population explodes uncontrollably, driving out most other species. These creatures need not be apex predators. Sea stars are prey for sharks, rays, and sea anemones. Sea otters are prey for orca. The jaguar, whose numbers in Central and South America have been classified as near threatened, acts as a keystone predator by its widely varied diet, helping to balance the mammalian jungle ecosystem with its consumption of 87 different species of prey. The lion is another keystone species. Keystone mutualists are organisms that participate in mutually beneficial interaction and the loss of which would have a profound impact upon
Masai, Johor and mid 20th century. Masai has gone through vigorous development which has transformed the town into one of the most populous towns in Johor. The Masai Chinese Primary School now has more than 5000 pupils. Shops include Today's, Yos Saver Store, Kip-Mart and Tesco. Bandar Seri Alam is the business centre for Masai, with MayBank, Public Bank, Bank Simpanan Nasional and Bank Rakyat and hotels. The Masai Main Street, Jalan Masai Lama, is the main road connecting Johor Bahru to towns at the east side of Masai such as Kota Masai, Kong Kong and Pasir Gudang. Meanwhile, Masai is also