The first Google Pigeon made its debut on July 2014. This is a codename that is used to describe the algorithm update for the search engine that is intended for the Google’s Local Search. Its purpose is to give the most relevant searches for users who are after local results. To date, this is only applicable on the local search outcome. It affects the organic listings of the Web and Map search of Google.
You must not confuse Google Pigeon with the other services, which codenames were derived from the names of avian creatures, such as the Google Hummingbird and Google Penguin. These three aim to give all the users a better search experience. Google Penguin is after the sites that implement Black Hat SEO techniques and penalize these sites.
The updates that come from Google Pigeon are different from that of the Google Penguin, but all the data are collected to identify the sites that violate the rules. The reach of Google Penguin is wider, since Google Pigeon targets local results.
To complete the trio and to help Google give the best search experience to all its users, Google Hummingbird utilizes the kind of search algorithm that is not based on keywords. It focuses on the natural and conversational approach that users utilize to search for items on the Web. Google Pigeon is targeted for local searches, but this is an important factor to help the other two methods to give the best results.