41. The social calls are interleaved between the echolocation calls. 42. Frequencies capable of being heard by humans are called echolocation while in flight. 43. Regarding the echolocation hypothesis-it seems quite doubtful. 44. DSC allows these bats to utilize these features to optimize the echolocation behavior. 45. Echolocation call produced by " Pipistrellus pipistrellus ", an FM bat.46. Two proteins have been found to play a major role in toothed whale echolocation . 47. Another reason for variation in echolocation is habitat. 48. Although they look very much like modern cetaceans, basilosaurids lacked the'echolocation . 49. It also plays a part in research work on the echolocation capabilities of dolphins. 50. Human echolocation is a learned ability for humans to sense their environment from echoes.