This is a MAJOR problem, because if we aren’t setting our research up to ask those questions, then we’ll never know! We’ll simply see an animal on a bridge and assume we’ve done a good job – when all the while the population could still be declining 5/n

Unfortunately, we don’t have good evidence that wildlife crossing structures can prevent a barrier effect or restore movement across an existing barrier. Instead, we usually have some kind of 'partial' mitigation 6/n