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Tweet of the Day is the voice of birds and our relationship with them, from around the world.

Chris Packham presents the flightless cormorant adapted to its Galapagos world. The isolated Galapagos Islands are famous for their unique wildlife which has evolved to adapt to a landscape free of predators. This absence of predators has allowed the native cormorant to dispense with the need to fly, why waste energy when there's nothing to fly away from? This is the only flightless member of the cormorant family, which feeds on fish and for that reason it has developed stronger feet for swimming after its prey. They nest on the rocky coasts of Fernandina and Isabela islands and the population can dip below a thousand birds especially after hurricanes or collapses in local fish numbers. They recover quickly though, but are vulnerable to introduced dogs which nearly eliminated the cormorants on Isabela Island.