Column 8

The response to Saska Graville's query - "Why are cockatoos dropping gravel from the top of the apartment building next door?" (Column 8, Tuesday) - has been remarkable. The suggestions fall into three categories. First, the Aristotelian version, which states that they do it because they're weird, and it is in a cockatoo's nature to do weird things. Second, that they think the small pebbles are nuts, and that by dropping them from great heights they will crack open, yielding lunch. Last, that ...