- **Reproductive strategy switching**: Discussion centered on whether any organisms dynamically alternate between lecithotrophy (yolk-feeding) and matrotrophy (maternal-feeding) strategies, or between viviparity and other reproductive modes.

- **Thrips as a case study**: A 1989 *Nature* paper was cited showing that thrips switch between viviparity and oviparity depending on the sex of their offspring (https://www.nature.com/articles/337357a0).

- **Human developmental parallel**: Humans were noted to transition from lecithotrophy (yolk sac) to matrotrophy (placenta) during gestation, though this is a developmental sequence rather than a facultative strategy.

- **Primate yolk sac evolution**: A 2020 review on the evolution of the primate yolk sac was shared as relevant background reading (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7387521/).

- **Terminology clarification**: Participants parsed the literal meanings of "lecithotrophy" (feeding on yolk) and "matrotrophy" (feeding on mother) to frame the biological discussion.