Despite their enormous size, blue whales can actually be quite difficult to spot from a boat.

Zoologist and presenter Mark Carwardine outlines just how hard whale spotting can be when conditions aren't ideal in the above clip... and promptly gets upstaged by the biggest whale on Earth.

This clip was taken from Big Blue Live, an exciting new series coming soon to BBC One in the UK and PBS in the US.

Click here for more information about Big Blue Live.

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