Suborder Megachiroptera- fruit bats or megabats or megachiropterans
Family Pteropodidae- all megachiropterans
Really cool audio at https://www.inaturalist.org/observations/9684527.

These giant bats descended in droves on the fig tree in our yard. According to Wikipedia, their wingspan is around 76 cm and they weigh up to 340g, putting them at the size of a small hawk. They make quite a variety of noises, some of which seem to be vocal and others with their wings, or at least given in flight. They are reported to move in massive groups, so these are probably the bats we've seen in massive roost exodus at dusk a couple of times in Moshi.
Thanks to Jakob at Afribats and Lara and Charles Foley for the ID.

While enjoying lunch on top of a hill in the Gunung Leuser rainforest, we were surprised by the sudden appearance of a lone wild orangutan who came climbing up the trees on the hillside. This wild individual was very shy but curious nontheless and watched us from the safety of his treetops.