see also http://www.ee.surrey.ac.uk/Personal/D.Jefferies/bird/birdsite.html for raw data. Birdsite stats. The data below are for bird box 1, equipped with a monochrome IR camera. Some years, box 2 has also been occupied and generated new birds. 1999 3 april bought box 4 april bird starts to build 10 april first egg laid 20 april last egg laid total 11 eggs one a day 21 april brooding starts 13 days incubation thirteenth day after brooding starts, hatching starts on 4th May 8th May male vanishes 10th May bird abandons brood. Zero birds produced. ---------------------------------------- 2000 7 april bird starts to build 23 april first egg laid 1 may last egg laid total 9 eggs. brooding starts 1 may 13 may eggs hatch 14 may 7 eggs from 9 have hatched. 13 days incubation 2nd June fledging fledging 20 days from hatching fledging 32 days from last egg fledging 40 days from first egg fledging 56 days from starting to build 7 birds produced ------------------------------------------ 2001 14 april building starts 26 april first egg laid nine eggs total until 4th may 5th may brooding starts 17 may eggs start to hatch 12 days incubation all 9 eggs hatched. 6 June fledging. fledging 20 days from hatching fledging 33 days from last egg fledging 41 days from first egg fledging 53 days from starting to build. 9 birds produced ------------------------------------------- 2002 22 March - building starts 17 april first egg laid seven eggs 27th april last egg brooding starts anticipated hatching 9th may anticipated fledging 30th may 09th may first two eggs hatched 12 days incubation two eggs from seven hatched. 30th may 07.30 both birds fledged fledging 21 days from hatching fledging 33 days from last egg fledging 43 days from first egg fledging 69 days from starting to build 2 birds produced. Note earlier season in 2002: warm winter. ------------------------------------------- 2003 10th March,nest building starts in box 1 23rd April, first egg in box 2. 25th April, first egg in box 1. 2nd May, eight eggs in box 2. 2nd May, five eggs in box 1 (after 2 day break) Brooding starts. 12th May six from eight eggs hatch in box 2 13th May three from five eggs hatch in box 1 15th May fourth egg from five hatches in box 1 16th May fifth egg from five hatches in box 1 31st May six birds fledge (of six hatched) from box 2 on day 20 from hatching. 31st May three birds fledge (of the three original hatchlings) on day 19 Two later hatchlings in box 1 did not make it. 9 birds produced. ------------------------------------------ 2004 26th March, nest building starts in Box 2. 21st April, first egg laid in Box 2 30th April, 8 eggs visible in box 2, clutch complete 14th May, hatching has happened. 3rd June, all eight young have fledged. fledging 20 days from hatching fledging 33 days from completed clutch fledging 42 days from first egg 8 birds produced. ----------------------------------------- 2005 Box 1 statistics 9th March, nest building starts 22nd April, first egg laid 1st May, completed clutch of eight eggs. 13th May six from eight eggs hatch 14th May one more egg hatches 15th May eighth and last egg hatches 2nd June all eight youngsters fledge fledging 20 days from first to hatch fledging 32 days from completed clutch fledging 41 days from first egg 8 birds produced. Box 2 statistics 10th March, nest building starts 27th April, estimated when first egg laid 2nd May six eggs visible 15th May four from seven eggs hatch 17th May all seven eggs have hatched 31st May, mother abandons young. Four alive, two dead, one missing. 1st June Rescue fails and remaining four young die when mother doesn't return No birds produced. -------------------------------------------- 2006 Box 1 statistics late March, nest building starts 20th April, first egg laid. 28th April, eight eggs 10th May, first egg hatches 13th May, 7 from 8 eggs hatched 22nd May, mother taken by predator 30th May father taken by predator 31st May, 7 birds from 8 eggs fledge fledging 21 days from first hatch 7 birds produced Box 2 statistics late March, nest building starts about 27th April, first egg laid. 3rd May, 7 eggs 4th May, 8 eggs 17th May, 7 from 8 eggs hatched 4th June, one nestling dead one nestling missing 5th June, remaining five nestlings fledge fledging about 20 days from first hatch 5 or 6 birds produced -------------------------------------- D.Jefferies@surrey.ac.uk 5th June 2006