How are eggs of different shapes made, and why are they the shape they are? When does the shell of an egg harden? Why do some eggs contain two yolks? ... Zobraziť viac
The last decade or so has seen a number of field studies, in Europe and the States, into the intricacies of the magpie way of life. The author has studied both species of magpie in Europe and the United States, and provides, in this text, ... Zobraziť viac
