Construction of Jasiniec–Grudziądz Węgrowo line – as part of environmental compensation for the disturbance of 91E0 willow riparian forests and 9170 oak-hornbeam forests natural habitats, by virtue of the environmental decision obtained, nesting boxes and roosts were provided in Toruń and Żołędowo Forest Districts in 2019 for:
- the common redstart, the European pied flycatcher, the Eurasian nuthatch, the Eurasian tree sparrow, the great tit, the willow tit, the coal tit – a total of 29 A- and A1-type boxes,
- the starling – 6 B-type boxes,
- the black redstart – 10 semi-open-type boxes,
- the short-toed treecreeper and the Eurasian treecreeper – 4 boxes,
- the common goldeneye – 1 box near the Vistula River on the height of pole No. 32, 1 box at the Papowskie Lake near pole No. 113,
- bats – Issel-type boxes (intended for, among others, the common long-eared bat, the grey long-eared bat, the lesser noctule, the mouse-eared bat, the common noctule, the Nathusius' pipistrelle) – 20 roosts,
- bats – Stratmann-type boxes (intended for, among others, the common pipistrelle, the soprano pipistrelle, the brown long-eared bat, the common noctule and the Nathusius' pipistrelle) – 20 roosts. In 2021, our naturalist carried out the cleaning and maintenance of nesting boxes and bat roosts as part of the annual box inspection. During the work, traces of nesting in the form of nest material or abandoned egg shells were found in most nesting boxes. No individuals were found in the bat roosts, as they are not breeding or permanent sites for bats – they are only periodic hideouts.