I stumbled a little woozily up the beach, clambering over the boulders of quietly hallucinatory colours, and then from my new vantage point saw Mark away in the distance on his knees and peering into an old log.

'Moulting little blue penguin,' he said when at last I reached him.

`What? I said. 'Where?

'In the log,' he said. 'Look.'

I peered into the log. A small pair of black eyes peered anxiously back at me from out of a dark ball of ruffled blue fluff.

I sat back heavily on a rock.

'Very nice,' I said. 'Where are we?

Mark grinned. 'I thought you seemed a bit jet-lagged,' he said. 'You've been asleep for about twenty minutes.'

'OK,' I said, irritably, 'but where are we? I think I've narrowed it down to New Zealand.'

'Little Barrier Island,' he said. 'Remember? We came here this morning by helicopter.'

'Ah,' l said, 'so that answers my next question. It's the afternoon, yes?

'Yes,' said Mark. 'It's about four o'clock and we are expected for tea.'

I looked up and down the beach again, thunderstruck by this idea.'

'Tea?' I said.

°With Mike and Dobby.'

'Well just pretend you know them when we get there because you spent an hour chatting to them this morning.'

'I did?

'Dobby is the warden of the island.'

`And Mike??

'His wife.'

'I see.' I thought for a bit. 'I know,' I said, suddenly. 'We've come to look for the kakapo. Yes?

'Correct.'

`Will we find one here?'

'Doubt it.'

`Then remind me. Why are we here?

'Because this is one of the only two places where there are definitely kakapos living.'

'But we probably won't find one.'

No.

`But we will at least get some tea.'

`Yes.'

`Well, let's go and get some. Tell me all about it again on the way. But slowly.'

'OK,' said Mark. He took a few last pictures of the little blue penguin, a bird which I was destined never to find out anything more about, packed away his Nikons, and together we set off back to the warden's lodge.

'Now that New Zealand is riddled with predators of all kinds,' said Mark, `the only possible refuge for kakapos is on islands -and protected islands at that. Stewart Island, in the south, where one or two kakapos are still found, is inhabited and no longer even remotely safe. Any kakapos that are found there are trapped and airlifted to Codfish Island which is just nearby. They are studied and protected there. In fact they are so well protected that there's a certain amount of doubt at the moment about whether we'll even be allowed to go there. Apparently there's some furore going on at DOC about...'

`The New Zealand Department of Conservation. There's a disagreement about whether to let us go there. On the one hand there's a feeling that we might do some good by getting some publicity for the project, and on the other there's a feeling that the birds should not be disturbed on any account. There's only one person available who could help us find the bird and he doesn't want to take us at all.'

'Who is he?

'A freelance kakapo tracker called Arab.'

'I see.'

'He has a kakapo-tracking dog.'

'Hmm. Sounds like the sort of person we need. Is there a lot of work for freelance kakapo trackers? I mean, there aren't a lot of kakapos to track, are there?

'Forty. In fact there are three or four kakapo trackers...'

'And three or four kakapo-tracking dogs?

'Exactly. The dogs are specially trained to sniff out the kakapos. They wear muzzles so that they won't harm the birds. They've been used to trap the kakapos on Stewart Island so that they can then be airlifted to Codfish Island and here to Little Barrier Island by helicopter. First time any of the species have flown at all for thousands, perhaps millions, of years.'

`What does a kakapo tracker do when there aren't any kakapos that need tracking?

'Kills cats.'

'Out of frustration?

'No. Codfish Island was infested with feral cats. In other words cats that have returned to the wild.'

'I always think that's an artificial distinction. I think all cats are wild cats. They just act tame if they think they'll get a saucer of milk out of it. So they kill cats on Codfish Island?

'Killed them. Every last one. And all the possums and stoats. Anything that moved and wasn't a bird, essentially. It's not very pleasant, but that's how the island was originally, and that's the only way kakapos can survive - in exactly the environment that New Zealand had before man arrived. With no predators. They did the same here on Little Barrier island too.'

At that moment something happened which I found a little startling, until I realised that it had already happened once that day, only in my befuddled jet-lagged state I had completely forgotten about it.

Coming from the beach we had trudged through thick undergrowth and along rough muddy tracks, across a couple of fields full of sheep, and suddenly emerged into a garden. Not just a garden, but a garden that was meticulously mown and manicured, with immaculate flower beds, well-kempt trees and shrubs, rockeries, and a little stream with a natty little bridge over it. The effect was that of walking into a slightly suburban Garden of Eden, as if on the Eighth Day God had suddenly got going again and started creating Flymos, secateurs, and those things I can never remember the name of but which are essentially electrically driven pieces of string.

And there, stepping out on to the lawn was Mike, the warden's wife, with a tray full of tea things, which I fell upon with loud exclamations of delight and hello.

Meanwhile, I had lost Mark altogether. He was standing only a few feet away, but he had gone into a glazed trance which I decided I would go and investigate after I had got to grips with some serious tea. He was probably looking at the birds, of which there seemed to be quite a lot in the garden. I chatted cheerfully to Mike, reintroduced myself to her as the vaguely Neanderthal creature she had probably encountered lumbering in a lost daze from the helicopter that morning, and asked her how she coped with living, as she and Dobby had done for eleven and a half years, entirely isolated on this island apart from the occasional nature-loving tourist.

She explained that they had quite a few nature-loving tourists a day, and the worry was that there were too many of them. It was so horribly easy to introduce predators on to the island by mistake, and the damage would be very serious. The tourists who came on organised trips could be managed quite carefully, but the danger came from people coming over to the island on boats and setting up barbies on the beach. All it would take would be a couple of rats or a pregnant cat and the work of years would be undone.

I was surprised at the thought that anybody thinking of taking a barbecue to an island beach would necessarily think of including a pregnant cat in their party, but she assured me that it could happen very easily. And virtually every type of boat has rats aboard.

She was a cheerful, sprightly and robust woman, and I very much suspected that the iron will which had been imposed on the rugged terrain of the island to turn this acre of it into a ferociously manicured garden was hers.

Gaynor emerged from the neat white clapboard house at this moment with Dobby, whom she had been interviewing on tape. Dobby had originally come to the island eleven and a half years earlier as part of the cat-killing programme and stayed on as warden of the reserve, a post from which he was going to have to retire in eighteen months. He was not looking forward to this at all. From where they were standing, in their domain of miniature paradise, a little house in a mainland town seemed desperately constrained and humdrum.

We chatted for a while more and then Gaynor approached Mark to record a description of the garden on to tape, but he gestured her curtly away and returned to the trance he had been in for several minutes now.