Great tits of Vlieland island

This video is called Great Tit (Parus major) singing.

In the 1950s, there were ten nesting great tit couples on Vlieland island in the Netherlands.

In the 1990s, this had risen to about 100 couples.

Now, there are about 250 great tit couples; plus some 65 blue tit couples.

Research has found out that great tits in the west of the island are genetically different from eastern Vlieland birds. An article about this in Nature is here.

Eg, in the west of Vlieland, there are on average 9.5 eggs per nest; in the east, 8.35.

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