This lab pack is great for intermediate aged students! There are pages for both external and internal anatomy. Also includes background information on crayfish and their different adaptations.
My elementary students get a lot out of doing animal dissections. This dissection lab can be used in older grades as well. As they are working, I am talking about the animal. For the crayfish dissection, we focus on animal adaptations. Students do a lot of observations during the lab. You only have to make a few incisions for this dissection. Just make sure the kids are careful when using the dissection equipment. We do the dissection after we have done labs with live crayfish. The live crayfish are caught from a local pond and returned when we are done.