In particular, the piece suffered from metallic staining, erosion, green caulking on the pedestal, and bird guano.

The lavish Victorian greenhouse for growing exotic fruit was built in 1897 with the wealth from selling bird guano for fertiliser.

Two more sets of avian related materials were found: a large amount of bird guano and a scattering of bird down.

The bird guano was found in Room 2W in Unit II.

There was a smear of bird guano in front of his eyes on the rough stone.

Removing bird guano is a constant task.

Day Four began with all eyes focused on a small island of craggy red cliffs covered in a thick white icing of bird guano.

Because water would collect on top, a plastic membrane could also turn into a sheet of bird guano that could spill into the water.

It has an orthorhombic crystalline structure, and is formed by the interaction of bird guano with weathering copper sulfides.

Nitrate minerals were replaced by bird guano, but only a small quantity was used locally, the rest was exported.