Great Horned Owl – on nest Methuen rookery!

March 9, 2014 in Great Horned Owl

The female Great Horned Owl continues on the nest located in the Heron Rookery in Methuen by the bike path.  She sits low in the nest and stays put through all types of weather.  She will get an A+ for her dedication!  Stay tuned!

Peregrines in copulation mode

March 8, 2014 in Near the Clock Tower

What a blessing to be able to observe, monitor, and document the Lawrence Peregrines over the last 2.5 years.  As an update from prior post, the peregrines continue to both be seen daily around the Clock Tower on Merrimack St. in Lawrence.  On Tuesday morning, had a strong feeling to dedicate extra time before work to stop, wait, and observe.  Just a few minutes before departing, the male peregrine went flying by and then landed on a perch. In an unusual twist, the male then changed perch locations 3 times in a few minutes.  He then perched on a stub iron beam just below the roof line above the loading docks at 200 Merrimack St.  This a is a regular perch.  To my surprise, another peregrine call emerged and really caught my attention!  The female was perched 2 floors below.  I’m thinking that……this could become interesting!  The female continued to call, turned her head, and many times looked up at the male while calling. Well, it is that time of year, and I’ve been fortunate to observe this pair in copulation mode in prior years.

From the Cornell Labs Birds of North America Online, here is a very accurate description of the peregrine copulation sequence: “Either sex solicits copulation.  Elements of solicitation displays may begin 3 weeks prior to copulation.  Female solicitation begins with vertical head-low bow accompanied by a whine when male is still at a distance.  As male approaches, female assumes horizontal head-low posture perpendicular to or facing away from male with panel feathers raised, accompanied by whine, and may be held up to 30 seconds.  The male mounts from the air.  He flies in and prepares to mount.

The female sleeks her feathers, crouches and leans forward and may move her tail up and to the side. During copulation, the female is at a 45 degree angle with wings slightly lifted and extended from elbow, sometimes with her tail partly spread.The male maintains an upright position during copulation by flapping high above his body and balancing on his tarsi with closed toes and feet turned inward.  The male chitters while she gives a copulatory wail.  It is fairly loud.

Completed copulations begin at least 2 weeks prior to egg laying.  During completed copulations, full cloacal contact ranges about 5 seconds earlier in the season, then up to 10 seconds.  The copulation activity is normally conducted in close proximity to the nest.  Copulations continue until the final egg is laid.” This sequence was exactly 10 seconds based on the time stamp on the photos!

For those with an interest, full photo sequence posted:




Peregrines: food transfer

March 5, 2014 in Near the Clock Tower

Classic food transfer just after sunset on a cloudy evening.  According to Cornell Birds of North American Online:  Transfer of food between mates (courtship feeding) may occur on ground or in air, but typically from male to female. Either sex initiates transfer. On ground, female solicits transfers with Vertical Head-Low Bow accompanied by a Food Wail. If male has food, female may also use eechup . Alternatively, female assumes posture of Begging juvenile, crouching, spreading tail, fluffing feathers, quivering wings, giving Beg vocalization or perches in fluffed upright posture, and Wails.

Peregrine defending nest territory

March 3, 2014 in Near the Clock Tower

A fascinating moment while observing a Cooper’s Hawk on a rooftop proximate by about 75 meters to the peregrine falcon nest box located in the Clock Tower.  The Cooper’s Hawk was perched on the edge of the roof.  Without much verbal warning the peregrine strafed to Cooper’s at first and then went into a more direct attack mode next round.  Found this description from Cornell Birds of North American Online:  “Cade’s model, with nesting cliff as center, in general seems fairly accurate: series of threshold perimeters surround eyrie with decreasing defense as distance from eyrie increases. Inner perimeter may be only 200 m; within that, attacks always occur. In outer perimeter, attacks only occur over food or favored perches.”  Now that Cooper’s hawk has been put on notice!