Wednesday, February 27, 2008

Herons, day and night.

A last post, for now, about birds at the Reifel Bird Sanctuary. Today, a couple of herons. First, the Great Blue Heron. The fannini race of this bird, which is the north Pacific coastal race, is Blue Listed in BC, meaning that its habitat requirements or other factors cause it to be considered under Special Concern. The fact that it is a colonial nester makes it potentially vulnerable even to very localized habitat disturbances.

But there certainly are a lot of them around here. There are large heronries in several Lower Mainland municipalities, and if you want to add this bird to your suburban Backyard List, install a pond and fill it with koi, the more expensive the better, and voila.


Smorgasbord.

A much less often seen species is the Black-crowned Night-Heron. Night-Herons (note the hyphen) are a widespread group whose monophyly is uncertain and relationships are unclear, as discussed in a recent post in Catalogue of Organisms.



Black-crowned Night-Heron. Reifel Bird Sanctuary, February 2008.

Southern British Columbia is at the northern extreme of the Black-crowned Night-Heron's range. It is considered rare in BC, and there are only a few records of it having bred in the province, perhaps only two -- both being on Reifel Island (Campbell et al., 1990). There is a small group that winters at Reifel. The birds can sometimes be found just inside the gate on the north side of the path, or in the brush at the the edges of the first large slough. Three were visible in the bushes very close to the split-rail fence across from the warming hut on our recent visit. If you want to work hard to add a BCNH to your list, go look somewhere else.

Refs

Campbell, R.W., N.K. Dawe, I. McTaggert-Cowan, J.M. Cooper, G.W. Kaiser and M.C.E. McNall. 1990. The Birds of British Columbia. Vol. 1. UBC Press. 514 pp.

1 comment:

Sally said...

Nice-- and thanks to the link to Chris's heron phylogeny.

You should link this (if you haven't; I didn't see it there; found it from Chris's heron post) from the Daily Heron. And any other old heron posts you have around, eh?