| [00:00.20] |
In these temperate seas, |
| [00:02.43] |
corals are replaced by forests of seaweed. |
| [00:05.78] |
In the summer, |
| [00:06.83] |
giant kelp can grow a staggering foot and a half a day. |
| [00:11.73] |
These waters may not support the diversity found in coral reefs, |
| [00:15.91] |
but they boast a far greater volume of animals. |
| [00:18.72] |
And a lot of fish means a lot of fish-eaters. |
| [00:22.41] |
Dusky dolphins off the coast of Kaikoura in New Zealand's South Island |
| [00:28.64] |
are so well fed that they can form superpods a thousand strong. |
| [00:34.08] |
After their epic journey from the tropics, |
| [00:36.42] |
the young bull sperm whales have finally made it. |
| [00:40.58] |
Sperm whales dive deeper than any other whale. |
| [00:44.19] |
They're drawn here by the fabulous wealth of deep-sea creatures, |
| [00:47.87] |
even the giant squid that lurk in the depths of a vast underwater canyon. |
| [00:54.03] |
To dive so deep and remain there for over an hour, |
| [00:57.34] |
whales must spend around ten minutes filling their lungs and blood with oxygen, |
| [01:02.56] |
much to the interest of a passing fur seal. |
| [01:05.80] |
These young bulls will now spend another 15 years |
| [01:09.47] |
bulking up in the nutrient-rich seas. |
| [01:11.55] |
Only when they have become 30-tonne giants |
| [01:14.54] |
will the largest predators on earth |
| [01:16.63] |
finally return to the tropics to compete for a mate. |
| [01:20.85] |
|