: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