Answer
The answer is as follows. 
Katrielle and the Millionaires' Conspiracy walkthrough
Puzzle Location: By the Thames (Top of the street light behind Seán Butchin)
Use the three enclosures to make a bed for the chicks.
Slide the enclosures so that all of the chicks are containded.
Place the enclosures so that the chicks are near the edges.
Place the circular enclosure at the top.
Place the triangular enclosure at the bottom.
Place the square enclosure so that there are chicks in its top-left and bottom-right corners.
The answer is as follows.