- Reduced availability of seed, especially later in the breeding season. Typically, twite raise a second brood of chicks in early August, this is not happening in the South Pennines, possibly because there is not enough seed.
- Reduced availability of suitable nesting habitat, which is primarily mature heather or bracken.
- Accidental and deliberate moorland fires. Accidental fires often occur through discarded cigarettes, campfires which have not been properly extinguished, or sometimes as a result of managed moorland burning getting out of control.