| [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] |
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