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The infobox can be used to display [[Bird measurement|avian measurements]]. An infobox is placed below the taxobox. Here is a sample:

==Usage==
{{Infobox bird
| collapsible = yes
| state = collapsed
| pop1  = Northern population{{Dummy ref}}
| data1 = {{Infobox bird/population
 | unit     = mm
 | lengthm  = 100-200
 | lengthf  = 110-200
 | culmen   = 100
 | wing     = 100-200
 | tail     = 100-200
 | tarsus   = 100-200
 | wingspan = 1000-1200
 }}
| pop2  = Nominate
| data2 = {{Infobox bird/population
 | unit     = mm
 | massunit = g
 | lengthm  = 100-200
 | lengthf  = 120-200
 | culmenm  = 130-200
 | culmenf  = 100-200
 | wingm    = 140-200
 | wingf    = 100-200
 | tailm    = 150-200
 | tailf    = 100-200
 | tarsusm  = 150-200
 | tarsusf  = 100-200
 | weightm  = 10-20
 | weightf  = 15-25
 }}
}}
<pre style="overflow: auto;">
{{Infobox bird
| collapsible = yes
| state = collapsed
| pop1  = Northern population<ref>Birds of ...</ref>
| data1 = {{Infobox bird/population
 | unit     = mm
 | lengthm  = 100-200
 | lengthf  = 110-200
 | culmen   = 100
 | wing     = 100-200
 | tail     = 100-200
 | tarsus   = 100-200
 | wingspan = 1000-1200
 }}
| pop2  = Nominate
| data2 = {{Infobox bird/population
 | unit     = mm
 | massunit = g
 | lengthm  = 100-200
 | lengthf  = 120-200
 | culmenm  = 130-200
 | culmenf  = 100-200
 | wingm    = 140-200
 | wingf    = 100-200
 | tailm    = 150-200
 | tailf    = 100-200
 | tarsusm  = 150-200
 | tarsusf  = 100-200
 | weightm  = 10-20
 | weightf  = 15-25
 }}
}}</pre>

==Parameters==
===General settings ===
; <code>collapsible</code>
: Set <tt>=yes</tt> to make the box collapsible.
; <code>state</code>
: Determines the initial collapsed state of the infobox. Set <tt>=collapsed</tt> to put the box in collapsed state initially. Set <tt>=expanded</tt> to put the box in expanded state initially. Set <tt>=autocollapse</tt> to have the box's initial collapsed state be determined automatically based on the number of other templates in the article that also have the "collapsible" attribute. (Has no effect if <tt>collapsible</tt> is not used)

===Bird specific ===
The infobox supports up to 4 populations or subspecies, each having its own ''pop'' and ''data'' parameter. The data parameter should be filled in with {{tl|Infobox bird/population}} and its respective data.

Each {{tl|Infobox bird/population}} should have the {{para|unit}} parameter filled in. Examples:

*{{para|unit|in}} (displays inches and millimetres)
*{{para|unit|mm}} (displays millimetres and inches)
*{{para|unit|cm}} (displays centimetres and inches)

The {{tl|Infobox bird/population}} has several optional parameters, including all of the following:

*{{para|length}}
*{{para|culmen}}
*{{para|head}} (bill-tip to back of skull)
*{{para|wing}}
*{{para|wingspan}}
*{{para|tail}}
*{{para|tarsus}}
*{{para|foot}} (tarsus + longest toe used mainly for cranes and bustards}
*{{para|weight}} (requires {{para|massunit}} to be used, which accepts "lb", "kg", "g", or "oz")

All of these parameters are designed to accept either a number or two numbers with a hyphen in the middle.

Examples:
*{{para|length|30}}
*{{para|length|100-200}}
*{{para|weight|40}}{{para|massunit|oz}}

If a measurement is gender-specific, you can specify the gender by adding "m" or "f" to the parameter name, as in {{para|lengthm}}.

==Known issues==
Supports only four sections. References cannot be added to specific measurements. The infobox should NEVER be nested within a transcluded template. The expansion depth is large, due to the nesting of {{tl|convert}} and some string manipulators. If such a nested transclusion ''must'' be made, be sure not to include hyphenated ranges, as they will assuredly break.

==You can make this template better!==
That's right-- if you feel like improving the infobox, one place to start is by reducing the nested function calls in {{tl|convert}}, or by creating a lightweight version for use with the infobox.

<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox | |
<!-- Categories below this line, please; interwikis at Wikidata -->
[[Category:Animal infobox templates|Bird]]
[[Category:Taxobox templates]]
}}</includeonly>