Bird Alarm is free to download but you need to be a member to use it.
Bird Alarm is an application for bird watchers that spread information and knowledge of birds worldwide. When a user discover a bird he sends an alert with the mobile phone and inform other bird watchers immediately when a bird is detected. Bird Alarm makes it easy for users to share discoveries with each other and find interesting rarities. It will give you high quality alerts from reputable bird watchers!