Pigeon

This particular video was from a few years back so it's not a current thing, but I believe at least one of these squabs survived to adulthood. What normally prevents successful nesting there is movement of the shipping containers before the pigeons have time to hatch anything, this particular set got lucky in their choice of location (long term storage at the back of the stack so it didn't move for months).

Apart from that rather major downside shipping containers make for pretty good pigeon habitat - multiple gaps like this and rats/cats find it hard to climb up to get to them (these pigeons are nesting on the roof of one hi cube container and covered by the floor of another container stacked on top). Unfortunately one does have to keep moving them around and in/out of the yard so the pigeons get thwarted in their efforts.