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Vancouver, British Columbia

Statistics - Fledging

The table below shows the number of (Barred) owlets fledged by each breeding pair in the years for which I have any reliable data. I am still gathering information from my records. Note that in the very early years I was not fully aware of the multiple territories and hence was not visiting all the areas.

I last update this page in 2009. It is now 2018 and well overdue for this update. In that time I have continued monitoring the owls, but with fewer other (people). This does mean that statistically speaking I now have a smaller observational set of data, so there is a growing possibility that I am missing more activity in this report.

That said, it does seem that there has been a general decline in owls in the park over the last ten years. Whether this is due to human activity it is hard to say. Certainly the human presence in the park's "off trail" areas has grown, especially in the "northern" owl territory. But the terrain has also undergone some natural changes - especially after the storm of late 2006.

 2007 was also the year that I conducted a systematic survey and found the three nest sites.

Since 2011 there have been no young recorded in the nothern territory. However, I (and others) do continue to see the occasional single (?) adult owl in that area. It also seems that the Western pair have expanded to the north. But there have been changes in the west too - in 2014 the adult female died after the pair sucessfully rasied three young. That was from natural causes - a disease curried by pigeons.

Of course, given the lifespan of wild Barred Owls it is obvious that more than one pairing must have changed over the 18 years I have known them. The only nest site that I believe has remaind unchanged (since 2007) is that of the Eastern pair - somewhere notrth of Beaver Lake and fortunately (for the owls) still quite hard to access (for humans).

Year

East

North

West

South

Total

Notes

2001

2

1?

n/a

n/a

2-3

I did see adults in all territories, but was not active in the western or southern areas. There may have been more than one juvenile in the north. First year I was aware of juveniles (photo records).

2002

1

2

n/a

n/a

3

The northern young were to the south of their territory. Is it possible that there was no north-west/south split prior to this? The eastern owls were seen most often around the Miniature Railway.

2003

?

3

n/a

n/a

3?

This may have been the year that I observed the territorial dispute between northern and western owls (but I need to compare records with the other people present at the time).

2004

?

2

n/a

n/a

2?

At the time I was not aware of the existence of a western territory, so was not monitoring the area.

2005

1

1

n/a

n/a

2

The eastern owlet was found dead near Beaver Lake on June 30th.

2006

1?

1

3

n/a

5?

The first year that I was fully aware of the western territory. Additional people were monitoring that year.

2007

2?

2

1

n/a

5?

Early in the season 2 juveniles were observed in the east, but later only one, then it was found dead near Beaver Lake on October 5th. The body is in the hands of the Ecology Society. Initial examination revealed malnutrition.

2008

0

1

2

n/a

3

The Northern juvenile was rescued after a fledging accident. Later released and observed feeding. Only the occasional adult was seen in the east - suggesting breeding failure (or none tried).

2009

0

2

1

0

3

There were 3 healthy owlets in the park (August 19) - actively hunting for themselves yet still being fed by parents. The owls at the Southern (new) and Eastern sites appear to have fledged no young this year. Also, the Southern pair did not last long - one owl was hit by traffic.

2010 2 1 2 n/a 5 An excellent year for Barred Owls. There were also 2 Great Horned Owls in the Northern area for Spring and Summer, but they have not been seen since. Though individual owls are reported most years - post breading dispersal?
2011 1 or 2 ? 0 1 ? n/a 0 - 3 Observations were scarce this year.
2012 2 0 1 n/a 3 Only an adult seen in the North this year. The other territories did OK.
2013 1 0 1 n/a 2 A relatively poor year for breeding success.
2014 2 0 3 n/a 5 A good year but unfortunately one adult (western pair) died late in the season.
2015 3 0 1 ? n/a 3 - 4 The Western male appears to have found a new mate, but at a new nest site? One of the Eastern owlets was found dead near Beaver Lake, July 18. It had been seen with its siblings the previous day - all flying well. Possibly hit by a bicycle?
2016 3 0 1 ? n/a 3 -4 The western owlet was not seen until very late in the season (august 29).
2017 2 ? 0 1 ? n/a 2 - 4 The western owlet was not seen until very late in the season (august 27). I only have photographic records of 2 in the east but I though I recalled 3 - anyone else have information?
2018 1 ?         it's too early in the season (June 25) to know much, but any young should have fledged by now. I did hear owlets call the first week of June (Beaver Lake / Eastern territory) but could not locate them. I have just heard of a sighting reported to the Nature House on June 12.

I would welcome any observations from others that could augment (or correct) these statistics.