“…These include: definite and indefinite articles, relative clauses with relative pronouns, the 'have'-perfect, nominative experiencers, participial passives, negative pronouns and a lack of verbal negation, and verb fronting in polar interrogatives (for full list of 'Standard Average European' see Haspelmath, 2001, on the exceptionality of northwestern European languages, see Cysouw, 2011). This skew means that we know much less about features more common outside of European sprachbund, such as tone (Singh & Fu, 2016), polysynthesis (Kelly, Nordlinger, Wigglesworth, & Blythe, 2014;Mithun, 1989), obviation (Henke, 2021), ergativity (Bavin & Stoll, 2013), and clause chaining (Sarvasy & Choi, 2020), to name but a few. It also limits our understanding of how children might acquire typologically rarer phenomena (e.g., symmetrical 'Philippine-style' voice, see Garcia & Kidd, 2020), which are existence proofs of what is possible in natural language and may be particularly challenging to theories built primarily on very different languages.…”