Need some help with my eggs

[FF]

Hello. I am getting around 15 eggs a day but I don't have a clue who is laying what. I have 8 Black Australorps,15 Production Reds, 1 Deleware, 3 Red sex links and 3 EE. The thing is I get this really dark Brown egg almost every single day and sometimes 2 a day. I am just wondering what breed it would come from. It looked like this but I can get the actual picture of the eggs if needed.
Heres what teh real dark ones look like. I only get 1-2 eggs day like this.
http://www.flickr.com/photos/tinybanquet/208303341/
Heres what teh majority of my browns look like. I get
http://www.fotosearch.com/FDC105/901155/

THANK YOU to any and all who reply!!! Dusty

 

[Chicken Frenzie]

The black Austrolorps are laying the second set of eggs, the first is PROBABLY by your Production.. EE's lay green eggs... =P