Property talk:P8556

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extinction date
date that a species or language is thought to have gone extinct

Data type	Point in time
Domain	fossil taxon (Q23038290), languoid (Q17376908), extinct taxon (Q98961713) or noble family (Q13417114)
Example	Raphus cucullatus (Q43502) → 1690 quagga (Q45969) → 12 August 1883 quagga (Q45969) → 1878 Old English (Q42365) → 1100 Homo floresiensis (Q186266) →
See also	dissolved, abolished or demolished date (P576), date of disappearance (P746), IUCN conservation status (P141)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Future dates Dates in Gregorian calendar before 1582 Dates before year 1 (Help:Dates#Years BC) Date on January 1 (Help:Dates#January 1 as date) Database reports/Constraint violations/P8556 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 165 Main statement 158 95.8% of uses Qualifier 6 3.6% of uses Reference 1 0.6% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Type “fossil taxon (Q23038290), languoid (Q17376908), extinct taxon (Q98961713), noble family (Q13417114)”: item must contain property “instance of (P31)” with classes “fossil taxon (Q23038290), languoid (Q17376908), extinct taxon (Q98961713), noble family (Q13417114)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#Type Q23038290, Q17376908, Q98961713, Q13417114, SPARQL

Citation needed: the property must have at least one reference (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#citation needed

Scope is as main value (Q54828448), as qualifier (Q54828449): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#Scope, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#Entity types

Qualifiers “sourcing circumstances (P1480), applies to part (P518), refine date (P4241)”: this property should be used only with the listed qualifiers. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#allowed qualifiers, SPARQL

Item “IUCN conservation status (P141): extinct species (Q237350)”: Items with this property should also have “IUCN conservation status (P141): extinct species (Q237350)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P8556#Item P141, SPARQL

This property is being used by: be-x-old:Шаблён:Інфармацыя пра мову be-tarask:Шаблён:Інфармацыя пра мову Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Visualization of timeline

#defaultView:Timeline
SELECT ?item ?itemLabel ?value ?img
{
	?item wdt:P8556 ?value .
	OPTIONAL {?item wdt:P18 ?img.}
	SERVICE wikibase:label { bd:serviceParam wikibase:language "ru,en"  }    
}

Try it!

Work to be done

There are lists of extinct animals on Wikipedia [1]. It would be useful to import that data into WikiData! The-erinaceous-one (talk) 09:51, 24 August 2020 (UTC)

Lists of Extinct Species

List	Status
List of extinct mammels	Finished.
List of extinct birds
List of extinct languages
ru:Животные, вымершие после 1500 года	In progress. Completed up to 1600.

Difficult Items to Classify

Occasionally we'll come accross an item that is tricky to add extinction date (P8556) to, so let's collect them here so we can sort them out.

Item	Reason for difficulty	Solution
Hispaniolan edible rat (Q301328)	Extinction date is given as a range	My solution was to use earliest date (P1319) and latest date (P1326) as qualifiers and set the value of extinction date (P8556) to the center of the time span.
Puerto Rican hutia (Q1767062)	Extinction date is only given as "early 1900s"	I set the date to the decade of 1900s and used "sourcing circumstances" and "circa" as a qualifier. An alternative is to set the century and use "sourcing circumstances" "beginning of".