I know this is a photo of a Western Grebe that accentuates the bill length, but
I think it is a good illustration of how long and thin their bills are:
http://www.birdspix.com/wp-content/uploads/2012/01/Western-Grebe-575-cr.jpg ;
<http://www.birdspix.com/wp-content/uploads/2012/01/Western-Grebe-575-cr.jpg>
Here is a Horned Grebe with a fairly yellow bill:
http://3.bp.blogspot.com/_x29Pef-T4FQ/SBDMpa7vuFI/AAAAAAAAELc/Gwt8kcorI0k/s400/MN07+horned+grebe+100_8675.jpg
Jeff Gilligan