How to Use Owl Pellets in the Classroom Units

Dissecting and examining owl pellets provides a hands-on learning opportunity to explore a wide variety of related science topics. The pellets, which are regurgitated fur, bone and feathers of prey, allow students to see first-hand the eating habits of these special birds. Food chains, birds and their unique characteristics, the relationship between species and habitat -- or a comparison of animal digestive systems -- are some of the possible unit studies that can utilize this lab-style activity.

Instructions

1

Order owl pellets from a biological supply company or reputable distributor. Pellets should be sterilized prior to shipping. Sterilization rids the pellets of harmful bacteria and ensures safe handling.

2

Discuss the typical diet and digestive system of owls, prior to the lab. Highlight the lack of a crop and the need to frequently expel pellets. Students should predict what they will find as they dissect the pellets. If you know the type of owl pellets you have purchased, discuss the particular habitat and diet of that species, as well as the impact of animal populations on an owl's diet.

3

Demonstrate the dissection procedure for the class. Carefully remove bits of the outer layer of fur using tweezers and toothpicks. Set aside small bones on the dark paper so they are clearly visible. Identify various bones by comparing them to a bone chart. Animals are easiest to identify by the shape and size of the skull.

4

Divide students into pairs and instruct them to dissect their own pellets. Circulate through the room to offer assistance and answer questions, as needed. Some pellets may contain other materials such as seeds, tinfoil, or straw which have been consumed by the prey. Other pellets may contain droppings, cocoons or exoskeletons from insects that have used the pellet for food or shelter. These findings are especially useful in units about food chains.

5

Instruct the students to record their findings on the lab report form. List the number and type of bones found in the pellet and what type of animal they believe was consumed. Any other unusual findings should also be recorded.

6

Discuss the lab results as a class. Record how many of each type of prey were discovered. Decide if the animals consumed were consistent with what the class has learned about owls. Encourage students to make connections with material they have previously learned in the unit to their experience in dissecting the pellets.