The sentence you gave is mostly correct, but we can make it a little clearer by adding a small word. Here's the original sentence:
A Namaqua sandgrouse soaks its belly feathers and carries the water to its thirsty chicks.
It's almost perfect! To sound better, we can say:
A Namaqua sandgrouse soaks its belly feathers in water and carries the water to its thirsty chicks.
Adding in water helps explain what the sandgrouse is soaking its feathers in. So, the corrected sentence says the bird soaks its feathers in water and then carries that water to its thirsty baby birds.