The centrepiece of the campaign is a 90-second ad that shows a recently discovered colony of penguins flying to South America every winter, where they spend the chillier months basking in the tropical sun.
The channels from today and will also be seeded on viral video networks such as .
It features the line: "When amazing things happen on the BBC, you never have to miss them."
The ad, which contains a link to the iPlayer website, follows on from the first phase of the iPlayer campaign launched on Christmas Day.
'Miracles of Evolution' is presented by Terry Jones, the former Monty Python actor.
He said: "We'd been filming the penguins for days, without a hint of what was to come. But then the weather took a turn for the worse.
"It was quite amazing. Rather than getting together in a huddle to protect themselves from the cold, they did something quite unexpected, that no other penguins can do."
BBC viewers will see the penguins not only take flight, but fly thousands of miles to the Amazonian rainforest.
The iPlayer, which allows viewers to catch-up on TV and radio programmes after transmission, has been a huge success since its launch over Christmas.
Despite only one in five people households being able to use the service, more than 2.2m people used the iPlayer in its first month alone.
The most popular downloaded shows since launch include 'Doctor Who', 'Torchwood', 'Ashes to Ashes', 'Top Gear' and 'Six Nations Rugby'.
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