• Objects and actions

In the "Tao of Objects" Gary Entsminger wrote the following:

The world consists of objects and actions. Objects (or nouns, in grammatical terms) possess attributes or characteristics. Actions (or verbs) express or exhibit behavior.

 There are many different types of birds, but they have a common set of characteristics.

 Birds have 2 eyes, 2 wings, feathers, beaks, and 2 feet -- and usually tails (a kiwi is tailless).

 Birds generally can perform the peck, scratch, and flap methods.

 The majority of birds can perform the fly method.

 Penguins, and similar pelagic birds, can fly under water.

 Birds lay eggs.