April; end of winter or beginning of spring?

It might be the cruelest month, but this April was crueler than most.  So I was surprised to see yesterday that I'd racked up around 115 species over the month. How so, when migration feels so late to start?

Checking my eBird records i realised that nearly all of these are late wintering species. RT Loons and Red-necked grebes right up the Hudson in Manhattan in April!  Late juncos and rough-legged buzzards. It reads like a February census.

I wonder if the same climatic effects delaying our migrant arrivals are also retaining these late-staying wintering birds?

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I work in NYC and own a wildlife and wilderness agency specializing in the southern cone of South America. I still do some guiding down there, especially looking for Fuegian and Patagonian avifauna. I'm particularly interested in the wintering ecology of neotropical migrants, and in avian biogeography in general. You can follow me at - @domhall And find me at - AventuraArgentina.com