Langara estimates: Wayne (1973) Early 50's: 21-23 pairs Stability: 1915 - mid 1950's. 1968-1984: No. of fledged young: Lowest for entire island: 4 Highest " : 19-20. If nest has 3-4 chicks in a given year, odds are 57%, nest will be there next year; If nest 1-2 young, odds 77% your nest will be there next year. eg. Parents will be alive "Sealids have gone to hell." Offshoot: Commitment of adults to produce highest quality young, whether 1-2, or 3-4. It means adults work harder. Tundra - asynchronous hatch - - young "sacrificed" is needed; that is, younger ones starve. Anatium - either none, or all survive. Peb's production: ave 4 breeding span: 2-4 years. (3). 1980's: good production of young: 1970's: best year 13 young 1980's: worst year, 13 young. Further decline of falcon mid. 60's on Langara, from 7-9 to +/- 5 pair. - The Murrelet decline mirrored by falcon decline 1950's -> 1968; but did not follow Murrelet decline after 1968. Langara may always have 4-5 peregrines, even if Murrelets disappear all together. - 50,400 ancient Murrelet equivalents = 1 Falcon territory.