1.   When spills do happen, the causes vary.

2.   Why the October spill happened, in particular why the seals broke, is still being investigated.

3.   After all, the spill happens to be in the path of migratory birds now heading south to escape winter.

4.   For the fisherman at the Sanlucar docks, the fact that the spill happened in early Spring only made it worse.

5.   The spill happened in the middle of their breeding cycle, and many chicks and eggs were lost.