Sorry for another ID thread but really having trouble doing searches for there plants. Also is May Apple safe for bunnies? I can post a pic of that if i need to also.
The second plant might be garlic mustard. Bruise the young leaves and see if they smell sort of like garlic. You need to use your sense of smell (and sometimes taste) to identify many plants. Garlic mustard is safe for humans in salads etc. I've never fed it to the rabbits. http://www.agf.gov.bc.ca/cropprot/garlicmustard.htm
The heart-shaped leaves (5 & 6) may be some kind of wild violet. I can't be certain, however. I feed wild violet leaves to the rabbits in moderation. Please note that the seeds are considered toxic.
The best thing to do, I think. is to observe these plants for the next few weeks. Identification is much easier when they flower.