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
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, first nest building in box 1
23rd April, first egg in box 2.
25th April, first egg in box 1.