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Researching Regurgitation Researching Regurgitation

Researching Regurgitation - PowerPoint Presentation

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Uploaded On 2016-06-15

Researching Regurgitation - PPT Presentation

By Colin Hascup Period 1 13 Introduction We dissected owl pellets to find out what the b arn owls ate My comparative question was Where do owls eat the most prey My hypothesis was that owls in the northeast would have the most skulls My hypothesis was ID: 362671

owl pellet skulls owls pellet owl owls skulls pellets barn prey animals average bones southwest eat source northeast error

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Slide1

Researching Regurgitation

By Colin HascupPeriod 1 (13)Slide2

IntroductionSlide3

We dissected owl pellets

to find out what the

barn owls ate. My comparative question was “Where do owls eat the most prey?” My hypothesis was that owls in the northeast would have the most skulls. My hypothesis was

dis

proven

.

The

barn owls in the northeast had an average of 3.45 skulls in

each

pellet. The barn owls in the northwest had an average of 2.23 skulls in each

pellet. The barn owls in the southeast had an average of 2.53 skulls in each

pellet. The barn owls in the southwest had an average of 3.65 skulls in each pellet. I found these numbers interesting. The southwest had the most skulls. I think this is because the population of the prey animals is higher in the southwest than any other region of the

United

S

tates

.I had predicted that the pellet from owls in the northeast would have the most skulls. This is because I had 4 skulls in my pellet and some people in my class had up to 8 skulls. But I didn’t account for the other pellets in my class. In science, we need to use multiple samples.

Comparative QuestionSlide4

First we picked our owl pellet

s, then we weighed and measured

each pellet. We labeled the length, width and height of each pellet. Next we

dissected

our pellet

s.

W

e looked for bones using a toothpick and tweezers to pry apart the thick fur. We f

ound as many bones as we could. When we were done dissecting, we identified the bones and put them in specific categories

according to body part. Then we counted up the parts to determine how many full animals were in the pellet. We recorded how many animals we had and glued one of

the sets of animal bones to a bone chart and labeled it.

ProcedureSlide5

Bone ChartSlide6

Owl QuestionsSlide7

Graph of the types of prey animals found in pellets.Slide8

Graph of the number of prey animals found in pellets.Slide9

Graph of the average number of skulls in barn owl pellets.

Source:

California Owl Pellet AppSlide10

Graph of the number of bones found in my pellet.Slide11

Size of owl pellet chart

M

easurement

Size

Size of owl pelletSlide12

Charts of prey animals found in pellet

Vole

Mouse

3

1Slide13

Barn owls have adapted to become amazing birds of prey. The dissection of owl pellets was used to figure out what owls eat. A complete skeleton of a vole was constructed with the bones from the owl pellet.

In addition, extra research was conducted to evaluate “Where do owls eat the most prey in the United States?” For this research the California Owl Pellet App was used. The hypothesis that owls in the northeast region of the United States would have the most skulls was refuted. Owl pellets had the most skulls in the southwest, possibly because there are more prey animals in the southwest. However, only one source was used to obtain the average numbers of skulls in the pellets. These numbers could have had a possible source of error. There is human error from counting wrong or

mis-identifying the skulls. Another possible source of error is that pellets from other owl species could have been included. A way to improve this lab would be to use multiple sources for finding the data. Owl pellets are a very useful scientific tool to help scientists determine what owls eat. In

addition

, apps like the California Owl Pellet App have pros and cons. They are useful because many people can report data. This is good because it gets a lot of samples, but bad because it might introduce a lot of error.

C

onclusionSlide14

Fun Facts!!!

1. Barn

owls screech, they do not hoot.2. The

barn owl’s heart-shaped face collects sound in the same

way as

human ears.

3. Its

hearing is the best of any creature tested.

4. Owl chicks in the same nest will feed each other.5. In order to live and breed, a pair of barn owls needs to eat around 5,000 prey items a year.

6. The barn owl is found on every continent except Antarctica.7. Nests

are usually in barns or holes in trees, but sometimes they build their nests in quarries