Dolphins
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:31:02
just offshore a dolphin tosses
a snake eel about like a ragdoll

:31:07
the others approach the tossed
prey with great interest

:31:10
but they will not touch it
observing some kind of protocol

:31:20
scientists have speculated
it's a way of confirming

:31:23
trust or simply avoiding
a costly conflict

:31:33
when calves catch their tiny fish
they too make a great show of it

:31:43
by five or six years old
:31:44
young dolphins no longer
need their mother's guidance

:31:48
they will be part
of a hunting culture that will

:31:50
forever be as
challenging as it is perilous

:31:57
dolphins have
adapted to an alien world

:32:00
that is hostile
to air-breathing mammals

:32:04
in the dark of night
:32:06
dolphins need to
know what's out there

:32:21
using their echolocation
:32:22
dolphins can detect the size
:32:24
shape- even the
density of an object

:32:27
but it's only
good for a hundred yards

:32:30
or so and is
highly directional

:32:32
detecting nothing
from behind

:32:44
it's so accurate
they can clearly

:32:46
distinguish between
different species of fish


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