Table 1. Coding of reproductive ecological traits used in these analyses.

Reproductive Strategy Trait	Value/State
Body Mass (BM)	kg
Hatchling Precociality (HP)	Superprecocial (coded as 0), Precocial (coded as 1), Semiprecocial (coded as 2), Subaltricial (coded as 3), Altricial (coded as 4)
Polygyny (FP)	Present/Absent [52]
Polyandry (MP)	Present/Absent [52]
Parental Care Strategy (CS)	No Care, Paternal Care, Maternal Care, Biparental Care
Higher Taxon (HT)	~Order (see S1 File for details)
Megapodes (ME)	Yes/No (see S1 File for details)