Relationship between echolocation frequency and body size in two species of hipposiderid bats

Frequencies of echolocation calls with maximum power of Himalayan leaf-nose d bats and Horsfield's leaf-nosed bats during searching phase were 74.1 and 92.1 kHz, respectively. Head-body length, forearm length and body mass of Himalayan leaf-nosed bats were 82.9 mm, 89.7 mm and 59.1 g, respectively; a nd the corresponding values of Horsfield's leaf-nosed bats were 68.4 mm, 61 .3 mm and 19.7 g, respectively. Echolocation frequency and the three parame ters of body size, head-body length, forearm length and body mass, were all negatively correlated, and the correlation coefficients were -0.86, -1.58 and -2.19, respectively. This study thereby proved that echolocation freque ncy and body size were negatively correlated in the two species of hipposid erid bats.