Biological networks such as metabolic as well as neural or cortical networks and their large-scale properties have received increasing attention in recent time. I will mainly present results on cortical networks, consisting of cortical areas and fibre connections between them, and also some results on metabolic and protein-protein interaction networks. First, I will examine how the small-world, scale-free and multi-cluster properties of cortical networks influence robustness towards structural damage. Then, I will describe a biologically motivated developmental algorithm to grow networks that are similar to cortical as well as other \\\\\\\\\\\\\\\'spatial\\\\\\\\\\\\\\\' networks (transportation systems, metabolic networks). As a by-product, the algorithm can yield multi-cluster networks with optimal wiring. Finally, I will give an outlook on the relationship between structure and function and the functional dynamics in cortical networks.