The Bat Cave is a designed cave system that provides a dedicated space for bats to roost and breed, supporting their vital role in local ecosystems. By offering shelter for these often-overlooked pollinators and insect regulators, the project contributes to broader efforts in biodiversity conservation. Developed within the Symb-io-nts framework, Bat Cave reimagines design as a tool for co-existence rather than control. It explores how human-made artefacts can serve non-human species, challenging anthropocentric design norms. Using digital fabrication and computational design, the project creates forms inspired by biological needs – inviting new ways of thinking about design as a practice of care, collaboration, and ecological responsibility.