On the day that the kingfishers began incubating their second brood the rain started again. A week later and the water levels are pretty much where they were during the floods in April. During my visit to the nest site on Saturday 9th June, I’m horrified to see a substantial section of the bank directly beneath the kingfisher burrow collapse into the river. The kingfisher burrow entrance, that had been in the middle of a smooth bank face, was now overhanging a gaping hole where the bank had collapsed away.
When the collapse happened, the female, who was incubating at the time, immediately exited the burrow and seemed very reluctant to return to the nest. She repeatedly flew across the river and hovered near the burrow entrance, but just didn’t seem to have the confidence to enter. A few minutes later she flew off downstream. Fortunately, the male returned to the nest shortly afterwards and flew straight into the burrow as if nothing had happened.
I stayed on site to wait for the female to return and I’m pleased to say that an hour later she returned. She perched opposite the nest and called to the male, who immediately flew across to perch next to her. A few seconds later the male headed off downstream and the female flew across to the burrow and entered. The following morning both birds were continuing to take shifts brooding and the water level had receded a couple of feet, exposing more of the chasm below the nest burrow. The nest chamber itself is about 2-3 feet into the bank, but if the top section of the bank collapses, it’s anyone’s guess as to whether the nest will remain viable.
In a final turn of events, the disused burrow to the right of the kingfisher nest was once again being visited by Sand Martins on Sunday morning. The martin’s were present most of the time I was there (about 3 hours), perching at the burrow entrance and entering, sometimes two at a time. Whether they’ll move in this time remains to be seen.