Très grosse journée de migration au Lac du Der.
Ce soir à 17H30, le nombre de Grues cendrées (Grus grus) au Lac du Der est impressionant, à mon avis plus de 40 000 individus.C'est donc une grande partie des Grues cendrées (Grus grus) qui a été observée en migration active ces 2 derniers jours en Allemagne (90 000 individus***).
C'est vraiment une année exceptionnelle.
***Info: Martin Kraft et
al.
The big wave from yesterday ended this morning at 1 a.m. But today Nov 12th 2013
there was another day with mass migration. In the Lahn Valley some 10 to 15 kms south of Marburg we counted some 12,000 migrating cranes from 9.30 a.m. until 4.30 p.m. Most of the mass migration
with at least 38,000 migrating cranes took place between Gießen and Frankfurt from 2 p.m. until 5.15 p.m. So our total number is at least 50,000 cranes (237 flocks). Amazing, two following days
with at least 90,000 migrating cranes. That happend never before! We are counting cranes since the late sixties!!
Kind regards,
Martin Kraft et al.
