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. 2019 Jun 19;6:195. doi: 10.3389/fvets.2019.00195

Table 2.

Full and abbreviated variable names and a short description of their biological meaning.

Variable Abbreviated Description
Culmen A Distance from tip of bill to forehead
Lower mandible B Length of the lower mandible
Bill tip to nostril C Distance between the tip of the bill and the nostril
Bill plus head D Length of bill and head
Head length E Length of head from the base of the bill
Head width F Width of head across the “cheeks”
Nail length G Length of the nail on the bill
Nail width H Width of the nail on the bill
Bill height I Height of the bill at its base
Bill height nail J Height of the bill right behind the nail
Bill height nostril K Height of the bill right in front of the nostril
Bill width L Width of the bill at its base
Height lower mandible M Maximum height of the lower mandible
Tail N Length of tail
Tarsus O Length of the tail
Toe nail P Length of the tarsus
Teeth Q Number of teeth in the upper mandible (one side)