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  catau, cau, llodriguera Bau burrow, tunnel gordeleku, habia antre, terrier, trou cova, lapa, pala, paleira, toba, tobal, tobeira, tobo, toco, toqueira conejera, madriguera, ratonera
caverna, gruta, oca caverna, cova Höhle cave haitzulo, haizpe, harpe, hartzulo, koba, kobazulo, leize caverne, grotte cafurna, caverna, cova, espenuca, furna, gruta, pala, palafurna caverna, cueva, gruta