Typically, white pines will retain needles for three years, but in autumn, 2-or-3-year-old needles will change color and drop, leaving only the current season’s growth still attached.
Not much goes on in the mind of a squirrel.
Huge portions of what is loosely termed ""the squirrel brain"" are given over to one thought: food.
The average squirrel cogitation goes something like this: I wonder what there is to eat.
- Kate DiCamillo, Flora & Ulysses: The Illuminated Adventures