At l 'FEIN Ornithological Observatory of Arosio, after a late August with a slight migratory movement characterized by the presence of Balia nera, Codirosso and Beccafico, a better start in September was expected. But only the Prispolone had a slight recovery in the second decade of September, still characterized by good weather and by high temperatures. However, a positive but not abundant presence of the Blackcap and the Robin, accompanied by the arrival of the first song thrushes which were ringed at the Scientific Facility and observed in the hilly area of the Prealps.
Very high temperatures are still reported. A few days ago the ANUUMigratoristi spoke of the first example of song thrush. The thrush in question is a juvenile specimen that was captured on Thursday 13 September 2018, to be precise at 6 in the morning. The animal was also immediately ringed with identification ring number Z506491. On the basis of the provisions of the Euring Directives, the biometric measurements were taken from the subject, as occurs in these situations. Consequently, the surveys covered fat, muscle, total weight, chord, third and tarsus.
Also according to the ANUU, the ringing of this 2018 season took place on a date that can be considered normal. The longest delay that can be remembered is 2006. Twelve years ago the song thrush was first captured in post-nuptial migration on 21 September. In 1977 and 2003, however, the thrushes were quite precocious and even caught the September 3th. Among other things, there is a further peculiarity for those who are passionate about statistics. The date of 13 September for this ringing was recorded already in 2007 and 2017.