When I was 15 years old.
One time sticks in my mind, I shot a squirrel, it dropped on the ground.
Then when I got to the tree, it was gone.
So I started walking back, and forth, getting closer every foot.
And about 10 minutes, I stepped on it.
There it was, burried in the leaves.

If it happens again, just walk back and forth where you saw it fall.
Every foot, thats how I used to find the squirrels, that dissapeared, after the shot.
In a grid type pattern, if you do this most times you will find it under the leaves.

I hope this helps.

Good Luck.

jrbsr