1.   There are four safe observation points overlooking the seabird colonies, but visitors must keep to the clifftop path -- sheer, high cliffs are dangerous.

2.   Seabird colonies in the Shetland Isles are recording significant breeding successes after a number of years of declining numbers.

3.   In the past the harvesting of seabirds for food and the predation by animals introduced by humans had a major impact on seabird colonies.

4.   There have long been efforts to control gulls at airports, landfills, reservoirs and seabird colonies.