In the burrow after hatching

Observing the inside of a kingfisher nest in real time via the web cam set up by the Nature Channel in Holland offers a unique glimpse into the world of kingfishers. Here is a selection of stills from inside the burrow.

 

Facts and figures

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.

overall-feeding

This graph depicts the breakdown of the 1593 fish fed. Blue shows the male count, red the female and green shows fish fed where it was not possible to identify the adults gender. During the final few days the size and voracity of the chicks, taking fish at the nest entrance, made it increasingly difficult to identify which parent was feeding.

 

The graphs below show the feed count and feed times for each day (click thumbnail images to view graphs).

 

All six chicks fledge in Holland

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Great news from the Nature Channel webcam site in Holland. On May 7th Between 5:20am uk time and 7:11am all six chicks left the nest. From the time the first chick hatched around 11:00am on April 12th, the chicks spent just short of 25 days in the nest being cared for by their parents.

On the facts and figures post page you can read more about some of the interesting statistics that were gathered by the volunteers on the site.

The guilty party?

badger

After a week monitoring the top of the kingfisher nest bank with a trail camera, shortly after midnight on Saturday the camera recorded this image of a large mammal right on top of the kingfisher burrow that had been dug out a few days earlier. It is a badger, and the other shots I have show it moving off along the bank shortly after this shot was taken. I had seen a trail in the grass that appeared to be evidence that something was regularly foraging along the bank,  so I thought that whatever had predated the nest would return sooner or later.

The kingfishers have already dug a new burrow and have begun mating. The new burrow is a few inches lower than the first, but with a badgers sense of smell I don’t think it would be safe, so I will be securing the surface with a large metal grid in the next few days.