variants:
or less commonly frontal plate
Definition of frontal shield
: a platelike prolongation of the base of the upper mandible over the forehead that is a characteristic feature of the coots and gallinules
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“Frontal shield.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frontal%20shield. Accessed 14 May. 2021.
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