Local parks and nature centers often have great programs. Some are specifically designed for Cub Scouts.
One of the easy bird feeders for kids to make is a craft stick platform. It can be made without peanut butter by substituting shortening.
In part 2 of this 3 part series about bird feeders for kids to make, learn how to make a bird feeder from a soda bottle and a wooden spoon.
Making a bird feeder is a great Cub Scout activity. Use it to complete requirements for Tigers, Wolves, Webelos and Arrow of Light.
Check out this fun terrarium project for Cub Scouts.