In The Birds of Peru all species of birds regularly found in Peru (>1,700) are described, and their approximate size given in inches and tenths of inches.

A brief account of each family is given in the list of families. The range of each species is described in detail (instead of range maps). In addition to the birds‘ geographical ranges, the altitudinal zones which they inhabit are given. The zones and their limits are:

• Tropical Zone:
sea level to 4500–5000 ft (1,400 to 1,500 m)

• Subtropical Zone:
4500–5000 to 7500–8500 ft (1,400–1,500 m to 2,300–2,600 m)

• Temperate Zone:
7500–8500 to 9500–11,500 ft (2,300–2,600 m to 2,900–3,500 m)

• Páramo or Puna Zone:
9500–11,500 ft (2,900–3,500 m) to snow line

The current app version contains the descriptions and images of 1,703 bird species found in Peru. Moreover, an ornithological dictionary (English, French, Spanish, Portuguese) and detailed illustrations and drawings of bird anatomy are included.

The app features a modern, intuitive graphical user interface with functions for searching the birds‘ names and in the full text, switching the sorting language for the listings and sort by English, French, Spanish, Portuguese, or the scientific (Latin) notation. In addition to the bird descriptions, the name of the birds in many languages can be displayed.

Another clever feature is the Field Note Editor, which allows you to record your bird sightings with predefined locations settings (which can be overwritten by the user) and many other commonly recorded data items.

Apart from using the optional backup and restore functions for Field Notes and Favorites, the app runs completely offline and there is no need for an internet connection during usage in the field.

As with The Birds of South America, which contains more than 3,000 birds found on the entire continent, also The Birds of Peru runs on any iOS device and can exchange Field Notes and Favorites list between identical app versions on two or more devices via Bluetooth.