Breeding Status
Males are more challenging to identify. We use a few 'status codes' - BB = breeding bird; SM = spring migrant; FM = fall migrant. For adult males in March through May, we generally assign SM to those that carry a good bit of visible fat beneath the translucent skin and BB to those that exhibit little or no fat.
![hanging the feeder outside the classroom](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/h-l/HummNewfield_RTHUinHand600.jpg)
Photo:
Russ Thompson
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