Passage: An Indonesian endemic, the Javan hawk-eagle occurs in humid tropical forests of Java.  Its range in East Java includes Sempu Island, Bromo Tengger Semeru National Park, Meru Betiri National Park and Alas Purwo National Park. It can also be seen in captivity in zoos like Kebun Binatang BandungThe Javan hawk-eagle is believed to be monogamous. The female usually lays one egg in a nest high on top of a forest tree. The diet consists mainly of birds, lizards, fruit bats and mammals.

Question: what does the diet consist of?
birds, lizards, fruit bats and mammals