|
The Tucuxi, Sotalia fluviatilis, is a very small dolphin found in the Amazon basin rivers and along parts of the eastern coasts of south and central America.
The chart below shows two clicks - the second is the same as the first but was received later after being reflected from the water surface. It is not a perfect mirror image because the click from the surface left the animal at a different angle to the centre of the sound beam and the click spectrum varies with the angle from the axis. Despite this, you can see that, at the start, the phase is reversed. Amazon River dolphins must be accustomed to receiving and gaining information from these two echoes, as the river is often calm enough to give very clean echoes.
The spectrum, shown in black here, is the spectrum of the first click, with the frequency scale in kHz shown below it. For more information on this species, please visit the Convention of Migratory Species web site.
|
