This laboratory exercise investigates the influence of population density on offspring number and size in burying beetles. Students test the theoretical predictions that brood size declines and offspring size increases when competition over resources becomes stronger with increasing population density. Students design the experiment, collect and…

Describes two working models of moths that can be used to test the eyespot function as an aversive property. Uses simple mechanical and electrical models as the "moths" and wild birds as the predators. Includes diagrams, methods, models, validation statements, and a discussion. (RT)

Describes results and experiences of four field-course experiments designed to explore the relationships between animals and their physical environment. Reports on the response of animals to flow rate of water, relationship between size and rate of locomotion, and mathematical and physical techniques used to study how animals live. (RT)

A portable and inexpensive blowfly trap, constructed from flower pots/buckets and mesh, suitable for introductory studies in blowfly succession is described. Investigations that examine species composition over time and the differences between baits are discussed. (KR)

The population of Gyrinus, the whirligig beetle, is assessed using the Lincoln mark-recapture index. This technique has the advantage of helping the student to understand simple proportion as well as other concepts. (Author)