They're like little human ducklings

Actually this desert cycle has been happening for hundreds of years, it's fairly unique to Australia. I commented more information above.

This is part of the desert cycle in many parts of Australia, the landscape and ecosystem is used to heavy rains up north flowing down for hundreds of kilometres along existing river beds, many towns expect these yearly flood cycles that bring large scale animal migration, it's been happening for hundreds of years. Australia is not California.

You might get more specific advice from r/landscaping or r/gardening

He's also a serial rapist

I'm glad someone did a crab, my first thought was the shiny crab from Moana!