Every year a pair of ducks breeds in Botany Pond, the artificial pond right outside my building. And in most years the ducklings disappear, either because they wander away or are taken by feral cats. Two years ago two faculty (I was one) lobbied for a “duck fence” to allow the ducklings to go up on shore and still be protected. They also built a “duck island” in the middle of the pond. I don’t know if these worked, but last year every duckling fledged, and we were all very happy.
This year we have a new brood, and they’re all alive so far, though it’s early days. Here they are yesterday, being fed by a student.
The pond also has turtles and goldfish. Click to enlarge, and note the worried mother standing (or floating) by: