It's common for theme parks and other large infrastructure projects to be stalled in the UK by the presence of a rare species of wildlife being discovered on the site.
For example, the ill-fated London Resort project in Kent was stymied by the presence of a rare species of jumping spider on the site. This led to the site eventually being designated a Site of Special Scientific Interest (SSSI), which basically put an end to any hopes of ever building on the site.
Universal's earlier attempt at a park in the UK 30-35 years ago, due to be located in Rainham in Essex, was stymied for similar reasons. The RSPB had profound concerns about the land being built on, and the proposal was cancelled and we now have a nature reserve, RSPB Rainham Marshes, there as a result.