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Bird Nerds

What to look for in September

Shorebird passage winds down, the first sparrows arrive, and every night with a north wind is worth checking the morning after. Where to stand this month.

Mira Shah

2 min read

September is the month with the widest range of possible outcomes. Almost everything is moving, very little of it is predictable, and the difference between an ordinary morning and a remarkable one is frequently just which night the wind came from.

(This post is dated ahead of today. It is sitting in the repository until its date arrives, which is how scheduling works here — see CLAUDE.md.)

Early September: the tail of the shorebirds

The adults have mostly gone through. What is left is juveniles, which are cleaner, crisper and better marked than the worn adults of July, and which is why September is the good month to actually learn shorebirds rather than merely count them.

Go at a falling tide, two hours after high. Take a scope if you have one.

Mid September: nocturnal migration

The warblers, vireos, thrushes and flycatchers are moving at night. The rule is simple and it holds up: after a night with a north wind and a clearing sky, go out at dawn. Birds that were flying stopped where the wind stopped being useful, and the first two hours of light are when they feed hardest.

A bad night gives you nothing. A good night gives you fifteen species in a hedge you walk past every day. It is worth checking the forecast the evening before rather than the morning of.

Late September: the first sparrows

The migrant sparrows start arriving as the warblers thin out. White-crowned, Golden-crowned in the west, White-throated in the east, and Lincoln’s Sparrow skulking under everything. Edges, brush piles, and the untidy corner of any park.

This is also when the raptor flights get going in earnest at any ridge or coastline that concentrates them.

The one habit worth forming

Pick a single site within fifteen minutes of home. Go every week, same rough time, whatever the weather. Write the list down every time.

By November you will have something no field guide can give you, which is a specific and personal sense of what your patch does in autumn. That is the thing that makes the unusual bird obvious when it finally turns up.