- Started 50 years ago by the Nature Conservancy.
- 1960s - serious concerns over the effects of organochlorine insecticides and organomercury fungicides on birds and mammals.
- Monitoring, experimental and ecological studies demonstrated adverse effects of organochlorine insecticides (particularly dieldrin and DDT) on predatory bird populations in Britain.
- Work contributed to scientific evidence that led to bans on agricultural use of these insecticides in Britain and elsewhere.
- PBMS has measured levels of these compounds in predatory and fish-eating birds ever since.
- PBMS is the longest running scheme of its kind anywhere in the world.
1962 Work starts at Monks Wood Experimental Station.
1966 Monitoring of polychlorinated biphenyls (PCBs) in predatory bird tissues and eggs begins.
1970 Monitoring of total mercury in predatory bird tissues and eggs begins.
1971 Monitoring of contaminants in gannet eggs begins.
1983 Monitoring of second generation anticoagulant rodenticides (SGARs) in barn owls begins.
2006 Monitoring of Deca-Brominated Diphenyl Ether (DBDE) in sparrowhawk begins.
2011 Monitoring of poly brominated diphenyl ether (PBDEs) in otter livers begins.
2012 PBMS report on flame retardants in otters.
2015 PBMS reports: anticoagulant rodenticides in sparrowhawks, mercury concentrations and stable isotope signatures in golden eagle eggs and perfluorinated compound (PFC) concentrations in gannet eggs.