I visited him in April 2016 and lent his nature diary. He has noted 20 vårfåglars first arrival date in Långliden between 1951-2011. 60 year notes will be science Mellannorrland and Sweden. Here we can see how the singing lark, Lapwings become rarer / later and that, instead, are the blackbird and chaffinch first in Liden during spring now. Arnold's diary has been submitted to the Administrative Board and the Swedish Species Information Center (SLU in Uppsala).
Mimi alitembelea yake katika Aprili 2016 na usaidizi asili yake shajara. Yeye alibainisha 20 vårfåglars kuwasili tarehe ya kwanza katika Långliden kati 1951-2011. 60 mwaka madaftari kuwa sayansi Mellannorrland na Sweden.