| spinner dolphin (Stenella longirostris) |
The Spinner Dolphin is usually dark gray, with darker patches in the tail stock, back and
beaks are distinctively long and thin, with a dark tip. The fins, also, are lengthy for dolphins of
this size. The dorsal fin is erect and leans forward in older males found in the Eastern Pacific
Ocean. Spinner Dolphins are the most variable in form of all cetaceans.
Adults vary in length from 129–235 centimetres (51–93 in) and weight from 23–78 kilograms
(51–170 lb). Gestation requires about 10 months. Females reach maturity at four to seven
years. Males require seven to
ten years. Their longevity is
unknown. Group sizes can
vary from just a few animals
up to thousands.
beaks are distinctively long and thin, with a dark tip. The fins, also, are lengthy for dolphins of
this size. The dorsal fin is erect and leans forward in older males found in the Eastern Pacific
Ocean. Spinner Dolphins are the most variable in form of all cetaceans.
Adults vary in length from 129–235 centimetres (51–93 in) and weight from 23–78 kilograms
(51–170 lb). Gestation requires about 10 months. Females reach maturity at four to seven
years. Males require seven to
ten years. Their longevity is
unknown. Group sizes can
vary from just a few animals
up to thousands.
Spinning
A possible reason for the animal's spinning is that males spin to attract females.
Another suggestion is that the bubbles may act as a target for echolocation by
other individuals in the school. Spinning may also be play. Individuals have been
spotted completing at least 14 spinning jumps in quick succession.
A possible reason for the animal's spinning is that males spin to attract females.
Another suggestion is that the bubbles may act as a target for echolocation by
other individuals in the school. Spinning may also be play. Individuals have been
spotted completing at least 14 spinning jumps in quick succession.
Communication
Dolphin echolocate and communicate using click-whistles and pulsed sounds.
Echolocation enables dolphins to track objects in dim or dark water and to, in
effect, see much further than their eyes will allow. Their complex array of whistle
sounds allow dolphins to talk to one another. Spinners can identify themselves
with sounds they make by trailing bubbles from their blowholes—sounds called
signature whistles.
Dolphin echolocate and communicate using click-whistles and pulsed sounds.
Echolocation enables dolphins to track objects in dim or dark water and to, in
effect, see much further than their eyes will allow. Their complex array of whistle
sounds allow dolphins to talk to one another. Spinners can identify themselves
with sounds they make by trailing bubbles from their blowholes—sounds called
signature whistles.
by Donald Griffin, whose work with Robert Galambos was the first to
conclusively demonstrate its existence in bats. Two bird groups also employ
this system for navigating through caves, the so called cave swiftlets in the
genus Aerodramus (formerly Collocalia) and the unrelated Oilbird Steatornis
caripensis. Echolocating animals emit calls out to the environment and listen
to the echoes of those calls that return from various objects in the environment.
They use these echoes to locate, range, and identify the objects. Echolocation
is used for navigation and for foraging (or hunting) in various environments.)
conclusively demonstrate its existence in bats. Two bird groups also employ
this system for navigating through caves, the so called cave swiftlets in the
genus Aerodramus (formerly Collocalia) and the unrelated Oilbird Steatornis
caripensis. Echolocating animals emit calls out to the environment and listen
to the echoes of those calls that return from various objects in the environment.
They use these echoes to locate, range, and identify the objects. Echolocation
is used for navigation and for foraging (or hunting) in various environments.)
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| info@abusalama.org |
| environmentally responsible through research & education |
 |
| |
 |