David Stephen

The swallow is possibly the best known of our migrants, being found nesting at farms throughout the country and in the remotest places. The bird winters in South Africa, arriving in Britain in March and April. Lt leaves again from September onwards.BÍRD MIGRATIONTHE ONLY certain thing known about...

The great whales, now the largest animals in existence, are placid, fish-litce mammals inhabiting the great oceans. In modern times, the end for most of them comes about in a wetterMammals are defined as that" ----dass of animals with warm blood and a covering of hair, which breathe atmospheric air...