1. Please don't use anybody's personal pictures for icons without their permission.
2. If you do have permission, please note "Photo by _____, used with permission" in your post.
3. You can use publicity photos from a park, but please credit that park in your post.
4. If somebody asks for credit when their icons are used, please credit them.
5. Probably any marine mammal icons should be fine. Nothing like... bats or anything though. =P Or monkeys. I hate monkeys.
6. Do not post monkeys just to spite me. ;)
If you have an icon request, feel free to post and ask, and perhaps somebody will make one for you.