In addition to the live camera feed, the Nature Channel website in Holland site has a clubhouse where volunteers monitor the kingfisher nest ( and other nest cams) 24 hours a day. The volunteers keep a record of how many times the chicks are fed each day and by which of the adults (fortunately the infra-red camera makes it easy to spot the lighter coloured lower part of the beak on the female).
Now that the chicks have fledged I have some statistics to share:
7 eggs were laid, 6 hatched after 1 egg was accidentally knocked out of the nest by parent.
24 days + 20 hours after the first chick hatched at 11:57 April 12, the 6th chick left the nest at 08:11 May 7.
During the first week the parents spent a large amount of time brooding the chicks, the female more than the male, who took on a larger percentage of the feeding at this time.
By day ten the adults were spending much less time brooding the chicks and the feed rate climbed significantly, the female bringing in significantly more fish than the male at this time.
The female continued to brood overnight in the nest with the chicks for eleven nights after the eggs hatched.
From day 10 to day 15 the highest feed rates were recorded, with 3 days of over 100 fish being fed.
By the time the chicks left the nest both parents had fed the chicks a similar number of fish, the male 577 (36%) and the female 594 (37%) (assuming that the 422 (26%) of feeds the counters were unable to attribute were evenly spread). In total 1593 fish were fed to the chicks.
The daily feed graphs showed that feeding commenced each day within a few minutes of sunrise, and finished in the hour before sunset.
Throughout the feeding period, the individual parents fed at irregular intervals, sometimes making several visits to feed within a space of a few minutes, while at other times they were absent for an hour or more. Despite this erratic behaviour, the cumulative efforts of both parents tended to even out during the course of a day, with the graphs showing a steady supply of fish being presented every day.
This graph shows a distinctive bell curve as the feed rate built to a peak and then tailed off towards the date when the young fledged.
This clutch of youngsters all left within a period of around an hour, the first chick exiting shortly after sunrise 6:19 local time (5:19 BST). Records from previous clutches at this nest site have shown that each clutch has left at a similar time, shortly after sunrise.
The graphs below show the feed count and feed times for each day (click thumbnail images to view graphs).