For example

• English (common) name: Blue Tit
• Scientific name: Cyanistes caeruleus
• Order: Passeriformes
• Family: Paridae
• Authority: Linnaeus, 1758
• BTO 2-letter code: BT
• BTO 5-letter code: BLUTI
• Euring code number: 14620

English name

At the top of each specie’s page, you will find the species’ common name, as regularly used in the UK. Increasingly, there is a move towards 'standardised’ English names, which usually means adding appropriate epithets to the more commonly used colloquial names (e.g. Avocet becomes Pied Avocet, to distinguish it from other Avocet species).

In general, BTO follows the taxonomy and species naming conventions recommended by the International Ornithological Congress (IOC) except where these deviate significantly from names in common usage in the UK.

Scientific name and authority

The species’ scientific* name is shown in italics underneath the English name. Scientific names comprise two parts: a generic name, which refers to a small group of closely related species, and a specific name. Together, these two names uniquely identify the species. For example, the scientific name for Blue Tit is Cyanistes caeruleus. 

The authority is the name of the person who first described the species with a scientific name (and the year the description was published).

*The scientific name is not Latin.

Bird order and family

Bird orders and families are part of the hierarchy which is used to classify all living organisms. Each order is made up of several families, and each family is made up of several genera (the plural of genus). The genus a bird belongs to determines its generic name.

Species Codes

Short-hand codes are useful for recording observations in the field, and later for entering and storing data in databases. Using standardised codes also helps to ensure compatibility between different recording systems, which means data can be exchanged between individuals and organisations seamlessly.

BTO and partners use three main coding systems:

• BTO 2 Letter Code: this is designed primarily for use in the field as a quick way of recording a species on maps. For common species the second 'letter' is a dot to represent a blank space, e.g. Blackbird is 'B.'. As there are a relatively limited number of combinations possible, codes are only available for species regularly occurring in the UK.
• BTO 5 Letter Code: this code is used primarily by the British and Irish Ringing Scheme. It provides a code for each species occurring in the UK, plus those that breed in Europe as listed by the second European Breeding Bird Atlas. In general, the code is formed from the first three letters of the first name and the first two letters of the second name (e.g. BEArded TIt is BEATI), or the first five letters of a single word name (e.g. GOLDFinch is GOLDF) but there are some exceptions. For example, Blackbird's code is BLABI, not BLACK.
• EURING Code: this is a numeric code used by ringing schemes throughout Europe for data exchange. Each species is assigned a five-digit number. The last digit is generally zero; this reserves it for different subspecies, so when a taxon is elevated to species rank there is no need to change the whole number. Find out more on the EURING website.

References

• Parkin, D.T. & Knox, A.G. (2010) The status of birds in Britain & Ireland. Christopher Helm, London.