while you dont have to worry about rabies, bats do carry alot of bacteria in their mouths and WILL bite if threatend, these bites, much like cat bites can cause all kinds of nasty infections.
bats are usually also protected species (though im not up to date on my Aussie laws)
PLEASE do not go around trying to catch, pick them up or generally handle them...they are cute, they are interesting and they are amazing to watch but PLEASE, unless you HAVE to do NOT handle them no matter what kind of bats they are.
they also stress incredibly easily and can die from the stress of being handled.
bats will NOT attack you...infact i dont think theres a single species of bat that would be considered "agressive" even the renowned vampire bat is actually a peacefull little critter...sure they do drink blood but generally from livestock and only a few drops lol.
bats are frequently pictured as "flying at peoples heads" because as we walk we kick up microscopic particles into the air. bats cant see very well, and to a bat you are simply a large "block" with lots of "little things" flying around you...which to a bat that consumes insects, is quite apealing...
to another bat a human on a bats sonar would look more like a wall or wide tree...otherwise known as the perfect landing post...it isnt untill they get closer that they realize you are not a good landing spot... and dart away
ive never heard of an actual case of a bat landing in someones hair/attacking them lol. and in the few cases where a landing or a tangle might happen, the bat has no desire to attack, simply to get free...
a panicing moving person is also quite hard for a bats sonar to decipher, the more you panic the more you confuse them, which is why they seem to "attack" they arnt realy attacking but instead trying to get away from the flailing oddity but since the person keeps moving...
unfortunatly id-ing them without a good picture is hard, but if its eating fruit you deifnatly have some species of fruit bat or pollen bat on your hands. they will roost anywhere that offers them a safe place off the ground preferably with a clear DROP below them.
how big are your bats?
that would certainly narrow it down.
fruit, pollen and nectar bats have a long "fox like" face hence often being refered to as flying foxes.
these 3 are in my opinion some of the most interesting. fruit bats actually prefer OVER ripe fruit but will eat anything from ripening
i do know however bareback bats prefer to roost in caves (most fruit bats are tree roosters)
some common fruit bats in queensland, the eastern tube nose, however these guys tend to roost alone and have yellow spotting.
could deifnatly be a black flying fox, they love banboo and mango groves for roosting and tend to form HUGE colonies, often theyll even roost with grey headed, little red and spectacled flying foxes.
http://en.wikipedia.org/wiki/List_of_bats_of_Australia
gives you a list of bats endemic to australia, some with pictures.
bats are incredible, ive not yet had the pleasure of working with any of the flying foxes...which is sad as they are my favorites, but i do work with bats frequently here in the us (and when i was living in the uk) as im a vector species rehabber...(i deal with animals that can carry rabies)
on of my FAVORITE bats i ever worked with was the pipestrelle, they are just so tiny and cute!
if your realy interested i suggest you contact any local zoos to see if they have any bat exhibits theyd be willing to let you get "behind scenes" at, and even call local vets and see if they can put you intouch with a local wildlife rehabilitator who works with bats that may be willing to let you help out and get some up close experience with these amazing "little" creatures
(maby)
