Various Caterpillars I.D. Please

I took a leisure walk into the wood today and found 2 distinctive different types of caterpillars, both species were found on two oak trees. Then upon returning home, I found another colony of cats. on my Red Buds tree. Could you help me I.D. these 3 species? One of the 3 looks very much like Datana contracta as mentioned by kwanjin, many thanks kwanjin.

First unknown, this one is a large cat. thinner than the typical sphinx moth cat. or Spicebush cat. But long, roughly 2.5" or more.
Kim

Here is the thread I initiated on another I.D. forum. Can you help? http://davesgarden.com/community/forums/t/1220409/

Another pix of the caterpillars on Red Buds tree this morning;

Ahah! According to one source, the above caterpillars are 'Red humps caterpillars' that feed on various hardwood trees.

So two solved, one more to go. The first large caterpillar on this header.

Okay, the first cat. maybe this one http://www.npwrc.usgs.gov/resource/insects/cateast/lochmant.htm. A Variable Oakleaf caterpillar. Second opinion please.