BY THE BAY: Birds bound for Alaska

The Boundary Bay region is a major stopover for flocks of sandpipers and other birds winging their way north

This is the time of year that over a million shorebirds visit local beaches as they head north for the nesting season.

The smallest sandpipers, collectively known as “peeps”, are tiny birds, each weighing only as much as a granola bar.

Individual birds are easily overlooked since their brownish-grey plumage blends with the mud. A large flock is much more noticeable, especially when they perform their amazing aerial displays.

Peeps fly 11,000 km on migration from their wintering areas in South America to their breeding grounds in Alaska, and the Fraser delta is one of only a few stopovers en route.

It is essential that the mud and sand flats of Boundary Bay, Roberts Bank and Sturgeon Banks remain viable habitat.

According to a 2014 study by Environment Canada and Bird Studies Canada, it is possible that the entire Pacific Flyway population of Western Sandpiper and Dunlin may be found on the Fraser River delta during migration.

The study authors calculated that 600,000 Western Sandpiper and 200,000-250,000 Dunlin, another sandpiper species, stop to feed just at Roberts Bank, with similar numbers occurring on Boundary Bay and Sturgeon Banks.

Each bird may stay only two to three days, foraging and roosting, before pressing on with its journey.

Sandpipers feed by probing in the mud for small creatures or by sucking up biofilm from the surface. If disturbed, they try and resettle just a few metres along to resume their feeding.

With the tide going out, the shorebirds become very spread out and distant, and can be difficult to observe. However, when the tide turns, the incoming water coaxes the feeding birds closer to shore.

With no more mud exposed, the birds sleep, preen, and relax, restoring their energy for the kilometres to come.

At this time, they are very vulnerable to attack from falcons and eagles and disturbance by dogs and humans.

Anne Murray,  the author of two nature books available in local book stores, writes monthly in the Peace Arch News – www.natureguidesbc.com

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