Birth of spot-billed ducks [2021] Mejiro Garden-Crow invasion, Tokyo

Spot-billed duck chicks were born in the Mejiro Garden in Toshima Ward.
One week after birth, the chicks were energetically swimming around the pond.
The chicks that stick to their parents and follow them, the chicks that swim around on their own, and the chicks also have their own personality, so I never get tired of seeing them.
After swimming in the pond, the parents and chicks go ashore and take a break. While taking a break, I hold the chicks under me so that my natural enemies will not attack them.
The crow seemed to be aiming for the chicks when they were on land, and they flew in several times, and each time the parent bird threatened to protect the chicks.
It is unlikely that all chicks will leave the nest due to the providence of nature.
Attacked by natural enemies such as crows, the number will be reduced little by little.
How many chicks will leave this year?
I would like to continue watching the growth of the chicks.
Japanese wild birds