se ▁are ▁produced ▁simultaneously . ▁This ▁may ▁reflect ▁both ▁l ary n ge al ▁and ▁nas al ▁contributions ▁to ▁the ▁vocal ization , ▁with ▁the ▁upper - fre quency ▁p uls es ▁produced ▁nas ally ▁prev ail ing ▁in ▁t ig ers ▁and ▁j agu ars . ▁ ▁The ▁vocal ization ▁is ▁produced ▁by ▁repeated , ▁short ▁p uls es ▁of ▁air ▁through ▁the ▁nose ▁and ▁mouth , ▁each ▁last ing ▁an ▁average ▁of ▁ 0 . 3 7 ▁seconds ▁at ▁an ▁average ▁frequency ▁of ▁ 2 4 8 ▁H ert z ▁in ▁t ig ers . ▁Fre quency ▁compos itions ▁are ▁similar ▁throughout ▁the ▁four ▁fel id ▁species , ▁however ▁they ▁differ ▁in ▁intensity ▁of ▁low - fre quency ▁components . ▁Total ▁numbers ▁of ▁p uls es ▁produced ▁per ▁vocal ization ▁shows ▁individual ▁variation , ▁but ▁tend ▁to ▁fall ▁in ▁the ▁range ▁of ▁ 4 - 1 0 ▁for ▁all ▁four ▁species . ▁Studies ▁on ▁t ig ers ▁have ▁shown ▁that ▁ac oust ic ▁energy ▁pe aks ▁in ▁the ▁low ▁frequency ▁range ▁and ▁the ▁power ▁w anes ▁in ▁higher ▁frequencies , ▁as ▁in ▁many ▁t iger ▁vocal izations , ▁yet ▁a ▁distinct ▁pattern ▁allows ▁pr ust en ▁to ▁be ▁distinguished . ▁ ▁It ▁has ▁been ▁found ▁that ▁t ig ers ▁are ▁most ▁sensitive ▁to ▁lower ▁frequencies ▁and ▁are ▁likely ▁able ▁to ▁hear ▁in ▁the ▁in fr ason ic ▁range , ▁which ▁is ▁likely ▁reflected ▁in ▁the ▁production ▁of ▁calls ▁such ▁as ▁pr ust en . ▁It ▁has ▁also ▁been ▁hypoth es ized