Bird pet supply represents a potential market niche because it's fairly specialized and yet people are clearly searching for products in this area. But you could segment even more.

Change the phrase in the search box from pet supplies to bird pet supply, and click the arrow. The search tool generates a second list with bird pet supply at the top with its 1376 searches. But second on the list is 81 searches for bird discount pet supply. Here is a niche within a niche people looking for discount bird supplies. You might not attract a lot of visitors to a site dedicated to discount bird supplies, but you can bet those that arrive at your site will be ready, willing and able buyers.

For that matter, look down the list a bit further and you will see 27 searches for pet supply bird cages. Couple this with the searches for bird discount pet supply, and you end up with 108 potential customers. You say this doesn't seem like many? Maybe not but if you could sell $20 worth of supplies to these people a month, you'd be grossing $2160 a month. Makes you think, doesn't it?

Since the Yahoo Keyword Selector Tool is free, you can run searches to your heart's content on anything from pet supplies to the Korean War (22,655 searches last month).

It's a great way to find market niches and the price is right!