Hydras are interesting!

In my homework I liked those links to hydras and sponges.  I learned that some hydras secrete a slime that must be cleaned from the tank if you have one.  They have a liking for beef and fried egg.  I think it is cool that some species eat and expel their food from the same end.  It was great to have the links in our homework leading to Wikipedia.  Most sponges that we use at home are synthetic, which means that they are not natural.  I am looking forward to dissecting the hydra in the future.  I don't know what variation it will be, so I don't know what to expect.  Anne Sophie