Owl Pellet Lab

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Michael Canfield 10/15/09 APES Owl Pellets-A Study of Food Webs The objective of this lab is to observe the type of species found in an owl pellet and how many of that particular species is present. It is also to observe the food web of an owl by examining its pellets. Once we found out information about our specimen, we compared it to the data our whole class obtained. In total, the class examined 25 different pellets, and found 55 animals within the pellets. This means that there were 2.2 animals per pellet. The information from the class told us that owls have a varied eating regiment. There were 11 different species found within the 25 different pellets. The numbers varied however. For example, The class ended up discovering 17 Townsend voles, being the most found species, and found only 1 Creeping vole and 1 Coast mole (those being the least discovered). Given the knowledge that owls normally produce about 1 pellet a day, one can conclude that an owl feeds twice a day because of the average concluded in this lab. The average was again, 2.2 animals per pellet. This lab could also help determine what kind of animal the owl prefers or has the least trouble preying. As stated before, Townsend moles were found most out of the 11 species discovered in the lab. Being the most, one may be able to determine that owls prey on them the most out of the others, and the owl preys the least on the Coast moles and Creeping moles (because they were preyed on the least according to the information). This information could however be misleading at the same time. Despite the facts being presented in the lab, it’s only a small experiment. If a larger scaled experiment was held, results could differ tremendously. The environment may hold a great deal of different information. For example, there may be an overabundance of one species, making them more

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