It seems dissecting various animals is a rite of passage for public school kids going through science class. Some don’t mind at all–it is a nice diversion from sitting in class listening to a lecture. There are issues though, ranging from those who don’t want an animal killed for science to those who simply don’t have access to the actual animal.
That’s where the Science Bank comes in. They have a page that links to several other sites where one may see a virtual dissection of many different types of animals, from the typical, like pigs or rats, to the unusual, such as a starfish, grasshopper or even a cow eyeball or a sheep brain.
One has to be careful, because some sites charge a fee, but to avoid this, just don’t click on a link with an asterisk.
Here is one free site for earthworm dissection that has many features:
Here is another free site for grasshoppers that allows you to choose which systems are visible or not, and whether or not the systems are labeled.
This site is a treasure trove for anyone interested in the biology of several different types of animals.