Student teacher
Check out acsonline.org It is far and away the best whale related website I have seen. There is an entire activity book that can be printed, plus info. on whale sounds, diving, sizes etc. Students can choose a whale and look at infomation on it.
Also, call you local museums to see if they have whale kits. I did this and the kit contained lesson plans, maninpulatives, activities, plus bones, teeth and a lower jaw of a dolphin. It was a huge hit!