Snake Perceptions-Dominant Sense

Question
QUESTION: For my science fair project- I want to test what is the # 1 sense snakes use in catching their prey: sound (vibrations-sensed in their jaw bone); smell (odors - Jacobson's organ) or sight (thermal images in their pits). The snake store man said I could use some of his snakes (which ones do you suggest?)and that he would make sure they were hungry so they would want to participate. Can you help me think of a way to test this so that the results prove the stimulus the snake chooses to go torward the most times is the dominant sense. I can't figure out how to make sure there aren't other factors interfering with the results.
My problem is if I put them in a plexiglass double crossed T maze that I build with mouse odor drops in spot # 1 and a heating pad in spot #2 opposite that and nothing as a control in spot #3 and then my ipod with earphones vibrating a recorded squeak of a mouse in spot #4(which the snake could still see) - what if he chooses the easiest place to go each time or the results are random then it doesn't prove anything. He might go to the closest or think that each thing is actually a mouse. Please help? I think if the snake is lazy and not hungry he might just go to the heating pad and rest on it. And if he goes to ipod he is using both the sense of sight and sound - and I get all mixed up with these dependent and independent variables and controls. I am only in 4th grade but I love snakes, birds, and fish and do research all the time. Please help me.

ANSWER: That's one ambitous project!  Here's an idea.  Earbuds in 4 stations.  Station one earbuds hanging in the air not touching the base of the station playing the mouse sounds (hearing).  Station 2 earbuds touching the station playing the same sounds, same times, same length (vibration).  Station 3 earbuds somehow scented to smell like a mouse-perhaps rubbed on a mouse right before the experiment(smell).  Station 4 earbuds that have been dipped in hot water (???-heat). Best I can come up with this early in the morning.  Work on it and get back to me if you have further questions.

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QUESTION: Here is what I am doing - a cross shaped plexiglass maze. Put in the snake and when he gets to the intersection he can choose -m go right to the earbud (i only have 1 ipod and earbud) sound - go left to the mouse oil odor or go straight ahead to the stuffed mouse dipped in hot water. I am going to use only Boas and Pythons since they have pits. I am going to try 10 snakes and record their choices.
My question now is: my teacher waNTS ME TO SAY WHAT MY INDEPENDENT VARIABLE IS AND PUT IT ON THE X-AXIS AND SAY WHAT THE DEPENDENT VARIABLE IS AND PUT THAT ON THE Y AXIX AND THEN TELL WHAT MY CONTROL IS (same maze/same position of stimuli choise setup) AND that is what I am confused about now.
The example shows a bar graph titled - Favorite Colors and the bottom axis shows red blue green yellow and the vertical axis shows 10, 20, 30, 40, 50, 60 with blue being the most and yellow the least. How can I make my data look like this with me getting the "sense" the snakes choose most to be the highest bar graph.
That is my folow up question.
Thanks y9ou.

Answer
What happens if he goes backwards towards the empty spot?  Also, if you always start them facing one variable that's not a good test.  Your independent variable would be the things you're putting in the maze.  The dependent would be which one is chosen.  You'd have to do a bar graph with four separate data points on the X, and the number of times each is picked on the Y.  How big is the maze?