Melanism

NASA GOES

March 20th marks the Vernal Equinox.  It's one of two points on our calendar when day and night are of equal length. More or less. It may be more of a convenient handle we put on an arbitrary point on our annual revolution around the sun, but it is significant in that it marks the point in the year where we start seeing more daylight than darkness.  So with the days growing longer, this is a great time to talk about photoperiod.

Robert Taylor via Flickr

It all started with a black squirrel.  These rare creatures aren't a separate species - they're your garden variety gray squirrel, but a genetic mutation has given them a black fur coat.  That got Dave wondering if a black squirrel has any advantages its fairer forebears don't (other than being incredibly popular among nature photographers).  Wondering turned to arguing.  

Robert Taylor via Flickr

It all started with a black squirrel.  These rare creatures aren't a separate species - they're your garden variety gray squirrel, but a genetic mutation has given them a black fur coat.  That got Dave wondering if a black squirrel has any advantages its fairer forebears don't (other than being incredibly popular among nature photographers).  Wondering turned to arguing.  

Robert Taylor via Flickr

It all started with a black squirrel.  These rare creatures aren't a separate species - they're your garden variety gray squirrel, but a genetic mutation has given them a black fur coat.  That got Dave wondering if a black squirrel has any advantages its fairer forebears don't (other than being incredibly popular among nature photographers).  Wondering turned to arguing.