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OWL PELLET PRE-LAB

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wirt
21 diapositives · 1.3K Views · Oct 07, 2014

OWL PELLET PRE-LAB. OWL PELLETS. Owl pellets are masses of bone , teeth , hair , feathers , and exoskeletons of various animals preyed upon by raptors. OWL PELLETS. These pellets are the undigestable parts of an owl’s meal that the bird will then regurgitate. OWL PELLET.

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  1. OWL PELLET PRE-LAB

  2. OWL PELLETS • Owl pellets are masses of bone, teeth, hair, feathers, and exoskeletons of various animals preyed upon by raptors.

  3. OWL PELLETS • These pellets are the undigestable parts of an owl’s meal that the bird will then regurgitate.

  4. OWL PELLET • The owl will first capture the prey before ripping them apart with his sharp beak and swallowing large chunks.

  5. OWL PELLET • These chunks make their way down the esophagus into the proventriculus, which secretes juices onto the food. • This mass then moves to the gizzard, which separates what the owl can digest from what he can not.

  6. OWL PELLET • The digestable portion continues on through the digestive tract. • The undigestable part forms into a round pellet. • This pellet moves back into the proventriculus where it will stay for many hours.

  7. OWL PELLET • Before the owl can eat again, he must regurgitate the pellet. • The owl appears to be in great pain and seems like he can not breathe during this process, but once the pellet is out, he is okay. • YouTube Video: Baby owl ejects pellet

  8. OWL PELLET • Looking into the pellet can give some idea of what the owl has eaten. • Pellets also indicate where an owl’s nest has been located.

  9. OWL PELLET • Owls are a type of raptor. • These are also called birds of prey. • Some other raptors are falcons, vultures, hawks, and eagles.

  10. OWL PELLET • Barn owls are very common and pellets are numerous. • A barn owl can usually be found in many habitats, but commonly in open woods. • They usually roost during the day in tree hollows.

  11. OWL PELLET • Barn owls usually eat small ground mammals such as voles, shrews, and mice. • These animals usually eat things like insects, nuts and berries, and sometimes worms.

  12. OWL PELLET • Owls differ from other birds of prey in how they eat.

  13. OWL PELLET • For instance, eagles soar in the sky looking for prey.

  14. OWL PELLET • Once spotted, it will attack with its talons and peck with the beak until the prey is dead. • The eagle then rips out the insides, eats, and leaves.

  15. OWL PELLET • An owl will swallow its prey whole.

  16. OWL PELLET • Owls have many adaptations that make them incredible hunters.

  17. OWL PELLET • They have large, forward-facing eyes that widen inside the skull, allowing the retinas to almost touch.

  18. OWL PELLET • Their retinas are so advanced that owls can catch prey in total darkness. • Owls also have very sensitive ear openings. • They can also rotate their heads about 270 degrees, giving them a wide range of vision.

  19. Helpful Links • Virtual Owl Pellet Dissection: http://www.kidwings.com/owlpellets/flash/v4/index.htm • Owl Pellets Song: http://www.youtube.com/watch?v=FENowCc-A8M&feature=related • Owl Pellet Dissection Video: http://www.youtube.com/watch?v=yPm689pxjV4 • Owl Pellet Lab Directions Online: http://crescentok.com/staff/jaskew/isr/biology/bpellet.htm • Dirty Jobs: Owl Vomit Collector: http://dsc.discovery.com/videos/dirty-jobs-owl-vomit-collector.html