Individuals and populations

Abstract

Off the north-west coast of Scotland, beyond the protective chain of the Outer Hebrides, lie the islands of St Kilda (Fig. 1.1). The fragmented ring of a tertiary volcano, the four main islands are steep and craggy, their low ground green with lush grass (Fig. 1.2). The steep sea-cliffs of the islands are streaked with the droppings of seabirds for whom the islands are a major breeding base. Over many centuries, the birds have enriched the islands' soil and their eggs and young have attracted humans for more than four thousand years. The earliest hunters left few visible marks on the landscape, but the dry-stone walls built by the farmers that followed still bisect the low ground and the ruins of their cottages are scattered across the lower slopes of the hills.