Megabat evolved early in the lineage of chiropterans. Although echolocation was later lost in family Pteropodidae, bats in the genus "Rousettus" are capable of primitive echolocation through clicking their tongues, and some species have been shown to create clicks similar to those of echolocating bats using their wings. Both echolocation and flight are energetically expensive processes. The nature of the flight and echolocation mechanism of bats allows for creation of echolocation pulses with minimal energy use. Energetic coupling of these two processes is thought to have allowed for both energetically expensive processes to evolve in bats. The loss of echolocation may
Bats of Canada their ability to fly, and rarely become aggressive. Careless handling of bats is the main cause of rabies transmission, which has resulted in five human cases in Canada since 1925. Fewer than 2% of bats in Canada are rabid, 95% of which are big brown bats. Testing bats for rabies is usually performed by the Canadian Food Inspection Agency. Inhalation of dusty bat manure may result in histoplasmosis, which will present as a mild respiratory infection. There are no pesticides that may be used on bats in Canada. In 2011, the Nature Conservancy of Canada received a $50,000 grant from