less so than other Australian snakes. There is a misconception that because they are red bellied (red for danger) they are a real threat, but not so, although their bite would put you down. Before I knew about them not being as aggressive as most, I had one climb up my paddle, whilst at rest, fishing from a canoe.............I nearly left the canoe to the snake, but it just sat sunning itself on the bow for about 3 minutes, then slithered back into the water. Apparently they are very good swimmers but I was in the middle of a lake over a kilometre wide so I guess it was just out of puff. I don't paddle now but to those who do, I would always say, rest your paddles horizontal across the gunnels and never leave one in the water whilst at rest.