Ammo is expensive. This is one of the reasons why it is beneficial to be proficient with hunting different animals with various types of weaponry. Something that is on the rise as of late, is the use of an air rifle on smaller game animals. When you use an air rifle, you can bring your dinner home for much cheaper than you regularly would be able to if you used a shotgun loaded with birdshot.
My dad had a house in the middle of the woods. Believe it or not, that house was in New Jersey. Whenever I went to his house when I was younger, I'd go hunting with him. Sometimes I'd bring my 12 gauge, other times, he just wanted to teach me how to learn their behavior. Or, to learn how to track them through the woods.
A lot of those experiences are a blur, but one thing I do remember with clarity is shooting my shotgun out of his bathroom window at a squirrel in a tree. I don't recommend you do that. Not with a shotgun, anyway. In fact, that may be illegal with any type of projectile-firing thing these days, so you might want to forget that you even read that.
Anyway, air rifles…
They are quiet enough that you can kill a squirrel without telling a lot of others that they, too, are also about to become dinner. A shotgun loaded with bird? Not so much.
They are also great because recoil is almost non existent. This makes them a great tool to teach younglings the basics of marksmanship and shooting mechanics.
Of course, it should go without saying that it is also harder to hit a moving target with such a small projectile. So, you also have to take that into account. But, if you can learn how to hit a small animal with a small projectile, stepping it up usually gets easier.
If you've got the money and feel like hunting something much bigger, like a boar, some companies do make big-bore air rifles. However, they are much more expensive to buy and shoot than their smaller counterparts are.
Regardless, if you have never considered hunting with an air rifle, now may be a good time to get started. Your wallet can only benefit from it.