Ocean animals such as otters and seals were thought to be the primary meal of coastal tribes people, but recent evidence shows the aforementioned trade networks exchanged oceanic animals for terrestrial foods from the interior. Any village could acquire fish, but the coastal and island communities specialized in catching not just smaller fish, but also the massive catches such as swordfish. This feat, difficult even for today's technology, was made possible by the tomol plank canoe. Its design allowed for the capture of deepwater fish, and it facilitated trade routes between villages.