| 1978 | 1982 | 1986 | 1988 | 1990 |
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| Eagle Owl | Stylized Owl | Snowy Owl | Snowy Owl | Stylized Owl |
| 1992 | 1992 | 1993 |
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| Cover | ||
| Pel's Fishing Owl | Pel's Fishing Owl | Barn Owl |
| 1993 | 1993 | 1993 | 1993 | 1993 |
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| Cover | Cover | Cover | ||
| Eagle Owl | Spotted Owl | Spotted Owl | Spotted Owl | Spotted Owl |
| 1993 | 1993 | 1993 | 1995 | 1995 |
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| Cover | Cover | Cover | Cover | |
| Eurasian Pygmy Owl | Barn Owl | Common Scops Owl | Ural Owl | Eurasian Pygmy Owl |
| 1995 | 1997 | 1997 | 1997 | 1997 |
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| Eagle Owl | Unidentified Owl | Long Eared Owl | Eurasian Pygmy Owl | Ural Owl |
| 1997 | 1997 | 1997 | 1997 | 1997 | 1997 |
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| Long Eared Owl | Eurasian Pygmy Owl | Ural Owl | Eurasian Pygmy Owl | Ural Owl | Long Eared Owl |
| 1997 | 1997 | 1998 | 1998 | 1998 | 1998 |
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| Cover | |||||
| Stylized Owl | Unidentified Owl? | Barn Owl | Eagle Owl | Barn Owl | Tawny Owl |
| 1998 | 1998 | 1999 | 2000 |
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| Little Owl | Barn Owl | Barn Owl | Unidentified Owl |
| 2001 | 2001 | 2001 | 2001 |
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| Little Owl | Boreal Owl | Unidentified Owl | Spotted Owl |
| 2002 | 2003 | 2003 |
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| Eagle Owl | Ural Owl | Stylised Owl |
| 2003 | 2003 | 2004 | 2004 | 2004 |
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|
Spotted Owl |
Eurasian Pygmy Owl |
Eurasian Pygmy Owl | Common Scops Owl | Ural Owl |
| 2004 | 2004 | 2004 | 2004 | 2004 |
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| Long Eared Owl | Barn Owl | Short Eared Owl | Barn Owl | Common Scops Owl |
| 2005 | 2005 | 2005 | 2005 | 2005 |
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| Cover Cover | Cover Cover | Cover Cover | Cover Cover | |
| Common Scops Owl | Common Scops Owl & Short Eared Owl | Eurasian Pygmy Owl & Ural Owl | Snowy Owl & Long Eared Owl | Barn Owl & Eagle Owl |
| 2005 | 2005 | 2005 | 2005 | 2005 |
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| Cover | Cover | Cover | Cover | |
| Unidentified Owl | Great Grey Owl & Short Eared Owl | Northern Hawk Owl & Tawny Owl | Tengmalm's Owl & Little Owl | Eurasian Pygmy Owl & Ural Owl |
| 2006 | 2006 | 2006 | 2006 | 2006 |
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| Cover | Cover | Cover | Cover | |
| Barn Owl | Short Eared Owl | Long Eared Owl | Long Eared Owl | Stylised Owl |
| 2006 | 2007 | 2007 | 2009 | 2010 |
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| Cover | Cover | Cover | Cover | Card |
| Long Eared Owl | Euler means Owl in German | Little Owl | Tawny Owl | Stylized Owl |
| 2010 | 2010 | 2010 | 2010 | 2010 | 2010 |
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| Card | Card | Card | Cover | Card | Card |
| Barn Owl | Stylized Owl | Barn Owl | Stylized Owl | Short Eared Owl | Ural Owl |
| 2010 | 2010 | 2010 | 2010 | 2010 |
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| Card | Card | Card | Cover | Card |
| Long Eared Owl | Eurasian Pygmy Owl | Barn Owl | Eagle Owl | Eurasian Scops Owl |
| 2010 | 2010 | 2010 | 2010 | 2010 | 2011 | 2013 |
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| Cover | Cover | Cover | Card | Envelope | ||
| Little Owl | Northern Hawk Owl | Boreal Owl | Snowy Owl | Stylised Owl | Stylized Owl | Stylized Owl |
| 2013 | 2014 | 2014 | 2014 | 2014 | 2014 |
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| Card | |||||
| Long Eared Owl | Great Gray Owl | Long Eared Owl | Ural Owl | Little Owl | Stylized Owl |
