Sunday 11 June 2023

Norfolk Rivers Trust, Ingoldisthorpe - 11th June 2023

 A collaboration with the North West Norfolk ringing group enabled us not only to gain experience of a species that we've never had the privilege to ring before, but also to get the birds wing tagged so that it is possible to identify the birds without recording the metal ring code. Marsh Harriers are known to travel widely and we look forward to receiving reports of the wing tagged birds in the future.

The nest was first discovered on April 17th and since that time the Norfolk Rivers Trust, the land owner and work being undertaken at the site has avoided causing disturbance to the nesting Marsh Harriers. Not long after we notified the trust about this nest a second was discovered a short distance away. Observations at a distance have shown this to be a site with a polygamous male bring food to females at both nests. The second nest is much less advanced than this one.

The toe span method was used to sex the nestlings, very important since male and female take F and G rings respectively. We were shown by the ringers who first developed the technique and used the method that was eventually adopted into the ringing scheme as the method to use 

Ringed under schedule 1 licence. Many thanks to NWNRG for their help.

4P, male weight 598g, wing 220mm, toe span 70.1mm - 25 days since hatching

4R receives its wingtag, male weight 605g, wing 197mm, toe span 74.1mm
 - the most downy and the last to hatch 23/24 days since hatching

4S, probable female, weight 701g, wing 231mm, toe span 81mm - the largest
nestling and fitted with a G ring - hatched 27 days ago

4T, male weight 556g, wing 218mm, toe span 69.1mm - 25/26 days since hatching

All nestings tagged and returned to the nest.

Total - 4

Marsh Harrier pulli - 4