Fruit bats are Megachiropteran bats. You can tell because they have larger eyes, generally larger and more dexterous thumbs and they also do not echolocate.
Brown bats are not micro or mega at all.They are regular sized bats that are as big as a small diner plate.Little brown bats are small when they are young.The babies are as big as a digital camera....
It is a microbat (Microchiroptera). It eats insects and scorpions. Most megabats eat fruit, nectar, and leaves. Also, megabats live in Africa, Asia, and Australia. Pallid bats live in North America.