I think these coot chicks are from the first brood to hatch in West Park this year. If so, they’ve grown big enough to make forays half way round the island.
They’ve also grown big enough to forage for some of their own food, while still able to persuade the parents to feed them almost continually.
If it is the same chicks, the numbers, sadly, have fallen from five to two or perhaps three despite the parents’ efforts.