# The names of birds, part 4

DevFeed: [The names of birds, part 4](<https://devfeed.tech/articles/the-names-of-birds-part-4-38664.md>)

Original publisher: [Read original article](<https://ericlippert.com/2023/02/03/the-names-of-birds-part-4/>)

Author: ericlippert

Published: 2023-02-03T17:17:57Z

Content type: article

Language: en

Sources: [Eric Lippert](<https://devfeed.tech/sources/eric-lippert.md>)

Topics: [Math and Logic](<https://devfeed.tech/topics/math-and-logic.md>), [function](<https://devfeed.tech/topics/function.md>), [functions](<https://devfeed.tech/topics/functions.md>)

Tags: [computer](<https://devfeed.tech/tags/computer.md>), [lambda-calculus](<https://devfeed.tech/tags/lambda-calculus.md>), [logic](<https://devfeed.tech/tags/logic.md>), [turing-machine](<https://devfeed.tech/tags/turing-machine.md>), [uncategorized](<https://devfeed.tech/tags/uncategorized.md>)

## AI overview

This article explains combinatory logic through the fictional identities of birds representing the S and K combinators. It shows how these combinators can produce the identity combinator and the duplication combinator, then connects combinatory logic with lambda calculus and computation.

## Source excerpt

The European starling is a lovely looking bird, though territorial, noisy and aggressive up close. Unfortunately, they are very invasive in North America. Most of the hundreds of millions of European starlings now living in the Americas can be found ... Continue reading ->