The early re-colonisation was very slow, because of contamination of the food chain by organochlorine pesticides, and the activities of egg collectors, and had reached only 14 pairs by 1976.
The early re-colonisation was very slow. This was because of contamination of the food chain by organochlorine pesticides. This was because of contamination of the activities of egg collectors. The early re-colonisation had reached only 14 pairs by 1976.