Cook's Lake

Aloha!  So here is what I found at Cook's Lake, the new site for our small mammal trappings.  We set up our trappings and I'll let you know what our results are tomorrow.  Let me go over the pictures so you can get an idea what I was trying to show you guys.  The pic in the top right is a typical wood tick.  I found 8-10 on me so far.  Luckily they are easy to find since they are pretty big and other than a big bite, they don't do any damage to us.  The last two pics are of some skulls we found.  The first one is of a deer and the second one is of a cow (Interestingly enough, if you look closely, you'll see a black dot on the cow's head.  That's a bullet hole!).  Lycos, the scientists' dog, seems to take a liking to the cow.  Ok, so here are my questions for you:

Journal question #6: The cow and the deer skulls show that they both have something sticking out of their heads.  What is the difference between the two?  Be as detailed as you can!

Journal question #7:  The two pics at the top left (The second one right below the other one) shows the two sites that we are trapping for small mammals.  There are big differences between the two.  Most noticeably, the first pic shows a large forest while the second pic shows an open field with very few trees.  

Can you think of any reasons why the trees in the open field are much shorter than the trees in the wooded area shown in the picture?