tara posts better known as responsible flying foxes frank to a little forest in sambir. it's thought to be the world's largest mammal migration. and one of africa's greatest unsolved mysteries.

these terrible us better known as responsible flying foxes frog to a little forest in sambir. it's thought to be the world's largest mammal migration. and one of africa's greatest unsolved mysteries. researchers from germany are trying to learn more about these mega bats to do that they're hoping to catch a few of them with a net the scientists are setting up a trap at 2 am because it must be ready before sunrise well they're flying foxes are nocturnal they can still see better by day than at night because unlike other bats find foxes don't anchor locate they use their sense of sight to navigate. as an instant isn't it's we must always keep the net off the ground and then open up the compartments so it hangs completely straight at the top so the bats don't see it and it deflate them well as it is not seen as the work in complete silence with no light and the only night vision goggles and then we hope will catch them but you never know. these are the images from the night vision goggles at night the flying foxes lead to trees where they've spent their day sleeping and set off i