Zipf's Law Of Abbreviation

 Zipf's Law Of Abbreviation is being obeyed by all Human Languages including Birds 

Almost all human languages follow Zipf's law of abbreviation, and it turns out, so do bird songs. This strange observation shows how many systems, not just human language, are guided by an unwritten, surprisingly consistent mathematical order. Zipf’s law explains how commonly spoken words tend to be shorter. The idea is so intuitive, birds appear to use it, too. Birdsong is incredibly important for nearly every bird species on Earth, as it plays a role in mating and communication. Now, scientists have discovered that birdsong actually follows a human linguistic trait known as Zipf’s law of abbreviation (ZLA), which explains the negative correlation between word length and usage. Developed by American linguist George Kingsley Zipf in the 1930s, Zipf's law of abbreviation states that the more frequently a word is used, the shorter that word tends to be, and vice versa. Rarely used words tend to be long, while frequently used words are short. For instance, the most common words in English are: the, be, to, of, and, a; all of which are very short. Some of the longest words, let’s say pneumonoultramicroscopicsilicovolcanoconiosis or antidisestablishmentarianism, don’t generally come up in conversation that often (unless you're very odd). When long words do show up often, we tend to shorten them. Television becomes TV, refrigerator becomes fridge, and influenza becomes flu. This doesn’t just apply to the English language. Linguists have demonstrated that Zipf’s law of abbreviation also exists in Chinese, Croatian, Czech, Dutch, English, French, German, Greek, Hungarian, Indonesian, Italian, Polish, Portuguese, Romanian, Russian, Slovenian, Slovak, Spanish, Sundanese, Swedish and more languages.

Who knew a tweet tweet could be so fascinating? Despite its size, the Carolina wren can belt out a very loud bird song. The study analysed 600 birdsongs across 11 populations, including seven different species, and found stronger patterns of ZLA across populations than in a single population. Birdsong is an indelible instrument in the orchestra of nature, alongside rustling leaves, roiling waves and the gentle hum of myriad invertebrates. And birds will use those songs for a variety of reasons, a lilting chirp attracts a mate, while a brassy screech warns of nearby predators. Similar to humans, language is central to all bird species, and even though we’re separated from these feathered friends by some 320 million years of evolution, birds have apparently picked up some linguistic tricks similar to our own. Now, biologists at the University of Manchester in the UK and Chester Zoo have found evidence that birds also appear to follow Zipf's law of abbreviation. “We know that birds and humans share similarities in the genes and brain structures involved in learning to communicate but this is the first time we’ve been able to detect a consistent pattern of ZLA [Zipf's law of abbreviation] across multiple bird species,” Dr Tucker Gilman, lead author and Senior Lecturer at The University of Manchester, said.

A new study led by scientists at the University of Manchester shows that much like humans, birds follow a linguistic law known as Zipf’s law of abbreviation (ZLA), or the brevity law. Discovered by American linguist George Kingsley Zipf, the law describes the negative correlation between word length and usage frequency. This is broadly true across all human languages, and University of Manchester’s Tucker Gilman, lead author of the new paper in the journal PLOS Computational Biology, believes the same can be said for birds.  “There’s still a lot more work to be done but this is an exciting development.” Gilman said. One major difficulty in establishing ZLA in bird species is that birds have a much smaller vocabularies than humans, and types of vocal expressions can vary wildly among species. So, to help make the analysis easier, the team relied on a new open-source computational tool called ZLAvian. But first, the team developed a new method for analysing birdsong on the individual level rather than the population level. Then, Gilman and his team analysed 600 birdsongs across 11 populations which included seven different species, including the California thrasher, redthroat, black-headed grosbeak, sage thrasher, Cassin’s vireo, western tanager, and gray strikethrush. They found that when comparing vocalizations across populations, a stronger ZLA pattern emerged than the one that popped up when analysing songs within a single population.

The team used a new open-source computational tool called ZLAvian that analyses bird songs, focusing on how the length of a note relates to how often each bird uses it. This statistical tool measures how strongly note lengths and note frequencies match for each bird, then combines those results across all birds to produce a population-level score. While individual populations didn’t always show clear signs of Zipf's law of abbreviation, a stronger pattern emerged when the data was combined, showing more frequently used birdsong phrases were significantly shorter. “Studying ZLA in birdsong is far more complex than in human language,” study co-author Rebecca Lewis, a conservation scientist at Chester Zoo in the UK, said. “Our research has taught that it’s important to look across a wide range of species when looking for language patterns and we hope ZLAvian will make it easier for other researchers to explore these patterns in more birds but also other animals in the future.” Dr Rebecca Lewis added further, “Birds often have very few note types, individuals even within the same species can vary widely in their repertoires, and classifying notes is tricky too,”. Scientists believe that many different animals follow this linguistic rule. It’s been documented in the songs of humpback whales, as well as the vocalizations of African penguins. "This isn’t the first study to apply the brevity law to birds. In February 2020, researchers led by the Equipe de Neuro-Ethologie Sensorielle of the University of Lyon/Saint-Etienne found that southern African Jackass penguins (named for their braying, donkey-like calls and not their personalities) also followed Zipf’s law as well as another linguistic rule known as Menzerath-Altmann Law, which states that intricate vocalizations are more likely composed of brief sounds than words with less vowels (i.e. “complimentary” vs “scrounged”). “The laws seem to reflect something deeper and more general about communication and information,” Chris Kello, a linguist expert from UC Davis, said.

It appears that the exploration of that deeper connection is just getting started. Ultimately, Zipf's law of abbreviation allows communication to become more efficient. It’s very similar to the “principle of least effort”, the idea that systems will naturally develop to choose the path which requires the least amount of energy to achieve a goal. Its presence in non-human animals highlights that it’s not a conscious choice or a quirk of human culture, but a fundamental rule shaping how many systems work. Zipf’s work went even deeper and got more mysterious. He also found that the most frequently used word in a language. in English, “the”, appears about twice as often as the second most common word, three times as often as the third, four times as often as the fourth, and so on. This separate but related pattern is known simply as Zipf’s law (as opposed to Zipf’s law of abbreviation), and it shows that languages are shaped not only by brevity, but also by a surprisingly consistent mathematical order for all.