The Great Horned Owl in Methuen is still incubating eggs in the nest.  Here we are at April 1st from a starting date of around Feb. 16th when she was first observed on nest.  She is likley very close to the time when the eggs will hatch.   According to the Birds of North America Online the clutch is almost always two eggs but can range from one to four.  Incubation is almost always by the female only.  She remains on nest throughout, and the male delivers prey to her at intervals throughout night.  The first delivery generally takes place shortly after dark.