In the vast expanse of Moulvibazar's Baikka Beel, there are wooden boxes painstakingly set up some distance apart from each other. These are handmade boxes, set up years back to facilitate nesting and breeding of Cotton Pygmy-goose. Moniruzzaman Chowdhury, site officer of the Centre for Natural Resource Studies (CNRS), in-charge of Baikka Beel maintenance, says every year