"I think it's a political decision, " said Nick Fothergill, global aerospace analyst at Banc of America.
"Probably the most dangerous single situation was filming the lions at night attacking the elephant, " Fothergill said.
Fothergill and Linfield couldn't use lights or normal cameras because they would have frightened away the animals.
Mr Fothergill's home was one of many flooded in nearby Talybont during torrential rain in north Ceredigion last June.
"A lot of the breathtaking cinematography in the movie was only achieved through this special camera system, " Fothergill said.
Fothergill and Linfield used state-of-the-art camera technology to capture nature's predator-prey interplay from great distances without disrupting the hunt.
Without the earth's 23.5-degree tilt to the sun there would be no seasons, no variation in daylight and darkness, said Fothergill.
Not a single image in the film was computer generated, Fothergill said.
Its huge, long-running contract with Saudi Arabia, known as al-Yamamah, accounts for more than a quarter of its pre-tax profits, according to Mr Fothergill.
"A Boeing win would not be as good for BAE as a Lockheed win, but it would be quite substantial, " said Bank of America aerospace analyst Nick Fothergill.
"Although the elephants and the humpback whales and polar bears are the animal stars, the other big star of the movie is the earth -- the planet itself, " said Fothergill.
But Mr Fothergill joked he would take the nest down once the crows' young had fledged because he feared looking ridiculous out at sea with a real crow's nest on his mast.
"In normal speeds it's gone in seconds, but in slow motion, when you see it lasting 40 seconds to a minute, you get a real sense of the beauty, the scale and the size and power of that shot which is exactly what we wanted, " Fothergill said.
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