Bird watching is a very relaxing and entertaining pastime. But squirrels can ruin it. Unfortunately, squirrels love to eat the same things that many birds do. In fact you can almost bet that if any bird will eat it, a squirrel would not say "no" to it either.
Squirrels are very smart, and very resourceful. And when they find an easy supply of food, they can be very determined. They have supreme climbing skills, and their ability to jump can be amazing.
The problem is that squirrels not only chase away the birds that are trying to eat, but that they tend to destroy the feeders themselves. If the feeder is too slow in dispensing the seeds for the squirrel, they will chew the opening to make it wider. Sometimes they will chew new holes into the sides of some feeders.