If you are Michael bat competitor is ghost mice, especially in miniature ghost mice (Suncus etruscus) which has a weight of 1.2-2.7 ounces, but with a length of 36-53 mm.
and the bat you Kitti has a competitive spirit, especially in a pygmy shrew rat is tiny (Suncus etruscus), which has a weight 1.2 - 2.7 G, but there is the length 36 - 53 mm