Drentse Raven-idylle Corvus corax in kiem gesmoord
Drentse vogels , Volume 19 - Issue 1 p. 58- 61
After settlement as a breeding bird in Drenthe in 2003, and successful breeding attempts in 2003 and 2004, the sole Raven pair refrained from egg laying in 2005, possibly partly caused by adverse weather conditions in early March (in 2003-04, laying had started resp. on 5 and 4 March) with deep snow cover (up to 50 cm) and severe frost (up to – 200°C). The pair was recorded within the confines of West-Drenthe up to early August. A freshly dead Raven was found at Aekingerzand on 1 9 August 2005; from then on, only a single Raven was recorded, probably the dead birds mate. The dead Raven weighed 1255 g, with a maximum wing chord of 423 mm and a head + bill length of 125 mm (bill length 78.7 mm). A post mortem showed that it was an adult male, with testes size being 6.5 x 4.5 mm. Some internal bleeding was found on head and breast, possibly caused by a trauma. Shotgun wounds were not present; poisoning could not be ascertained as the stomach was empty. Its moult score showed that most primaries, secondaries and rectrices had been renewed, with only the outermost (primaries, rectrices) and innermost (secondaries) either old or in the process of renewal (Table 1). Given the sacrcity of non-breeding Ravens in the northern Netherlands, and the poor dispersal of Dutch Ravens from stronghold Veluwe, it remains to be seen whether the female will find a new mate.
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