Structural

Salt - It is an essential part of wildlife's diet.  Some animals will seek it out while others get it through their diet.  You can put out a salt block (check with your local regulations), or add some salt to your feeders.  Do not overdue it.  Salt will kill vegatation.  A small spinkle in a feeder everytime you fill it is fine.

Knowing your weather is very important.  The personal weather station makes a great gift!  Learn more from Wind & Weather.