Welders gloves and butcher's mesh gloves are great when handling flying foxes and are the recommended gear for those animals, but these little bats are the size of mice and smaller. If I can't feel them through the glove then I can harm them by not being careful enough. Sometimes even surgical latex gloves are too thick, especially when I'm feeling for breaks in something the size of a toothpick.
I can usually tell by the behaviour of a bat if I'll need gloves or not. Until now broadnoses have been little cuties, but the actions of this last one made me suspicious from the start - hence the thick gloves. Which he bit through anyway. Bugger.