2.2. Ways of allocating Marimastat by wind turbine
There are two main processes by which wind farms can potentially have a significant impact on birds. First, they can pose a risk of collision with birds flying into rotor blades, resulting in increased mortality rates. Secondly, they can result in habitat loss, mainly through displacement of birds from an area around the wind turbines (effectively disturbing the birds from this zone)  and .
2.2.1. Collision risk
Overall, it is clear that birds are generally able to avoid collisions and do not simply blindly fly into wind turbines (Fig. 3). Collision rates are typically in the range of only 1 in 1000–10,000 bird flights through the wind farm, even in studies such as in Zeebrugge where relatively high numbers of collisions have been reported . In some cases, nerve net are considerably lower, such as at the offshore wind farm mat Utgrunden, where 500,000 eider (kind of birds) flights through the wind farm study area have been observed without a single collision being seen .