The numbers of Christmas Island Pipistrelle bats had dropped a lot in the last 20 years. It had once been seen all over the island, including in the Settlement. It went from at least 80% of its living range, and its numbers had dropped more than 90% since 1994. Research into the number of bats in January 2009, shows there were only about 20 bats left. The only known group resting place had only four bats. The last bat call was heard on 26 August 2009.