To catch a lizard, you can use several kinds of grass. I have shown 3 of them in the photo. You can find more information on wikipedia http://en.wikipedia.org/wiki/Festuca_ovina
Step 1: Make a Noose
Remove the leaves and the flower, so the only thing left is a straight thin thread. Make a noose on the top.
Step 2: Find Some Lizard and Try It
You can find lizards at sunny rocky places. Put the noose around it, and catch it. The grass is a part of lizards natural environment, so it is not afraid of it.
This instructable is for survival situation. If you want to try this be gentle, don't squeeze the lizard while catching it and release it unharmed.