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Happy New Year 1-4
Today:Start “mini-unit” on owlsMid term after owl test
Mini-before-Christmas Unit
General Info
Owl’s fill the niche at night which would be occupied by hawks in daytimeNiche – role organism plays in the
environment
Don’t build nests – use old crow or hawk nests
Diet – mice, rats, birds, insects, etc Spend day in covered areas
General Info
Over 200 species of owls8 can be found in PA
Hatching Eggs are not laid at the same time and
thus do not hatch at same time Why could this be a useful adaptation?
If enough food, all chicks surviveIf not enough food, ensures oldest will be
strong and survive (youngest chicks die)
Owl Chicks http://www.youtube.com/watch?v=UGShADzKjTI&feature=related
Eyesight Very large eyes Sight 50-100 x better at locating small
objects in low light than humans So, in their eyes they must have more…
Rods – cells that gather light in the eyeCones – cells that gather color
Eye’s fixed in skull – can’t move them Twist head to look around…some up to
270 degrees
Warm Up 1-5
What is a niche? Today:
Talons, Leading edge of wings, etc
Males vs. Females
Female birds of prey tend to be larger than the males
(same is true for many reptiles)
Talons
Have large sharp talons – used to kill prey
Two talons will face backwards and 2 forwards to grab prey
Wings
Leading edge of the wing are serrated to help muffle the sound of flight.
(Start about 3:30) http://www.youtube.com/watch?v=xJNRFxL3moM
Hearing Face is shaped like a disc to funnel
sound Many species of owls have
asymmetrical earsAllows them to locate prey more efficiently,
even if they can’t see it
http://www.youtube.com/watch?v=yps7pgq1TAk
Warm Up 1-6
How do asymmetrical ears help an owl locate prey?
Today:Owl pukeFinish movie
Hunting
Mostly sit and wait predator Wait on tree until prey is located
Warm Up 1-7
Why do we study owl pellets? Today:
Owl Pellet LabQuiz on Owl information tomorrow – Review
sheet due
Owl Puke Owl’s regurgitate prey remains – called a
pellet (or a bolus)Swallow prey whole – they cannot digest hair,
fur, nails, etc
These can be studied to determine the owls diet
Owl Puking (1:05) http://www.youtube.com/watch?v=waLiTmLr1nM&feature=related
http://video.google.com/videosearch?q=owl%20pellet&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wv#
Owl Pellet http://www.pond5.com/stock-footage/96545/owl-pellet.html
Quiz! 1-11
Quiz Review sheets due
Owl Pellet Lab
Work in teams of 2-3 Need 2 pieces of paper
One to break apart the pelletOne to place the bones
Your goal is to determine the identity of the organisms in the owl pellet using the bone key in the packet
The data table and lab questions should also be completed
Owl Prey Voles
Resemble mouse – shorter hairy tailStouter body
Moles (not owl prey)Spend most of life undergroundVery underdeveloped eyes
http://www.youtube.com/watch?v=UGShADzKjTI&feature=related – hissing chick
http://www.youtube.com/watch?v=xJNRFxL3moM - owl general info – wing serrations
http://www.youtube.com/watch?v=yps7pgq1TAk http://www.youtube.com/watch?v=yps7pgq1TAk&feature=fvw – prey under
snow http://video.google.com/videosearch?q=owl%20pellet&ie=utf-
8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wv# - owl pellet – breaking it apart
http://www.pond5.com/stock-footage/96545/owl-pellet.html - owl puking
http://www.youtube.com/watch?v=JVSXQKmL6ZM&feature=related – owl eating mouse