This is a Galapagos Islands mocking bird video.
From the BBC:
Darwin’s specimens go on display
The specimens, gathered by Darwin from the Galapagos, are said to be the “catalyst” for his transmutation theory – how one species changes into another.
A variety of differences between the specimens led to him questioning the “stability of species”.
The birds will go on show at London’s Natural History Museum next week.
The mockingbirds will feature in an exhibition dedicated to the pioneering work of the naturalist, which is part of Darwin200, a national programme of events running throughout 2009, celebrating the 200th anniversary of his birth.
“What is fantastic about these two birds is that visitors will be able to see for themselves the crucial differences that Darwin saw,” said Jo Cooper, the museum’s bird curator.
As a result of an earlier visit, Darwin knew that there was only one species of mockingbird in South America, yet he found a different species on each of the islands in the Pacific Ocean archipelago he visited.
From this, he reasoned that all mockingbirds in the world had descended from a common ancestor, because they shared a number of similarities with each other.
This ultimately led Darwin to the conclusion that all organisms on Earth had common ancestors.
Recent shifts in sea level, particularly the lows, may have had a major influence on evolution in the Galapagos, according to new research: here.