Toothed whales
Diagram illustrating sound generation, propagation and reception in a toothed whale. Outgoing sounds are red and
incoming ones are greenToothed whales (suborder odontoceti), including dolphins, porpoises, river dolphins, orcas
and sperm whales, use biosonar because they live in an underwater habitat that has favourable acoustic
characteristics and where vision is extremely limited in range due to absorption or turbidity.
Toothed whales emit a focused beam of high-frequency clicks in the direction that their head is pointing. Sounds
are generated by passing air from the bony nares through the phonic lips. These sounds are reflected by the dense
concave bone of the cranium and an air sac at its base. The focussed beam is modulated by a large fatty organ
known as the 'melon'. This acts like an acoustic lens because it is composed of lipids of differing densities. Most
toothed whales use clicks in a series, or click train, for echolocation, while the sperm whale may produce clicks
individually. Toothed whale whistles do not appear to be used in echolocation. Different rates of click production
in a click train give rise to the familiar barks, squeals and growls of the bottlenose dolphin. A click train with a
repetition rate over 600 per second is called a burst pulse. In bottlenose dolphins, the auditory brain response
resolves individual clicks up to 600 per second, but yields a graded response for higher repetition rates.
Some smaller toothed whales may have their tooth arrangement suited to aid in echolocation. The placement of
teeth in the jaw of a bottlenose dolphin, as an example, are not symmetrical when seen from a vertical plane, and
this asymmetry could possibly be an aid in the dolphin sensing if echoes from its biosonar are coming from one
side or the other.
Echoes are received using the lower jaw as the primary reception path, from where they are transmitted to the
inner ear via a continuous fat body. Lateral sound may be received though fatty lobes surrounding the ears with a
similar acoustic density to bone. Some researchers believe that when they approach the object of interest, they
protect themselves against the louder echo by quietening the emitted sound. In bats this is known to happen, but
here the hearing sensitivity is also reduced close to a target Enciclopedia libre Wikipedia
Diagram illustrating sound generation, propagation and reception in a toothed whale. Outgoing sounds are red and
incoming ones are greenToothed whales (suborder odontoceti), including dolphins, porpoises, river dolphins, orcas
and sperm whales, use biosonar because they live in an underwater habitat that has favourable acoustic
characteristics and where vision is extremely limited in range due to absorption or turbidity.
Toothed whales emit a focused beam of high-frequency clicks in the direction that their head is pointing. Sounds
are generated by passing air from the bony nares through the phonic lips. These sounds are reflected by the dense
concave bone of the cranium and an air sac at its base. The focussed beam is modulated by a large fatty organ
known as the 'melon'. This acts like an acoustic lens because it is composed of lipids of differing densities. Most
toothed whales use clicks in a series, or click train, for echolocation, while the sperm whale may produce clicks
individually. Toothed whale whistles do not appear to be used in echolocation. Different rates of click production
in a click train give rise to the familiar barks, squeals and growls of the bottlenose dolphin. A click train with a
repetition rate over 600 per second is called a burst pulse. In bottlenose dolphins, the auditory brain response
resolves individual clicks up to 600 per second, but yields a graded response for higher repetition rates.
Some smaller toothed whales may have their tooth arrangement suited to aid in echolocation. The placement of
teeth in the jaw of a bottlenose dolphin, as an example, are not symmetrical when seen from a vertical plane, and
this asymmetry could possibly be an aid in the dolphin sensing if echoes from its biosonar are coming from one
side or the other.
Echoes are received using the lower jaw as the primary reception path, from where they are transmitted to the
inner ear via a continuous fat body. Lateral sound may be received though fatty lobes surrounding the ears with a
similar acoustic density to bone. Some researchers believe that when they approach the object of interest, they
protect themselves against the louder echo by quietening the emitted sound. In bats this is known to happen, but
here the hearing sensitivity is also reduced close to a target Enciclopedia libre Wikipedia
| Swim and you have a near contact with dolphins, Playa del Carmen is the ideal place for this activity |
Swimming with dolphins:
Playa del Carmen, Quintana Roo, Mexico
Playa del Carmen, Quintana Roo, Mexico
Desing Jaime Vargas Villamil
During the Delphinus Trek you will submerge into the
dolphins' world, observing them from a completely different
and unique point of view. Experience the intensity of their
grace and muscular power and watch how they dive into the
water as only a few people have witnessed it.
Delphinus Trek provides you a completely safe underwater
breathing equipment that can be used by any one.
dolphins' world, observing them from a completely different
and unique point of view. Experience the intensity of their
grace and muscular power and watch how they dive into the
water as only a few people have witnessed it.
Delphinus Trek provides you a completely safe underwater
breathing equipment that can be used by any one.
If You, or your children wish to swim with
dolphins, to little minutes of Playa del Carmen
is Delphinus, within the park of Xcaret, where
more over to walk and to enjoy a wonderful
day within the park of Xcaret, You can to
swim with the dolphins and to take a video to
take from memory to house
dolphins, to little minutes of Playa del Carmen
is Delphinus, within the park of Xcaret, where
more over to walk and to enjoy a wonderful
day within the park of Xcaret, You can to
swim with the dolphins and to take a video to
take from memory to house
Dolphins' echolocation.
Delphinus TREK
Delphinus takes the experience of interacting with dolphins in their natural environment into a new frontier known
as Delphinus Trek.
If being close and touching dolphins seems to you as a unique moment, you can imagine how amazing it can be
to experience this adventure just like a diver underwater, in the most secure way possible.
Delphinus takes the experience of interacting with dolphins in their natural environment into a new frontier known
as Delphinus Trek.
If being close and touching dolphins seems to you as a unique moment, you can imagine how amazing it can be
to experience this adventure just like a diver underwater, in the most secure way possible.
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