There are two species of fritillary butterflies associated with the area, the pearl-bordered fritillary and the high brown fritillary. The pearl-bordered fritillary is known for its distinctive wing pattern. The upper side of its wings is a striking orange-brown colour with black markings. Its wings are decorated with a row of small, pearl-like spots along the outer edges, which gives the butterfly its name. The underneath of its wings has a similar pattern but is lighter and less colourful. The high brown fritillary is larger than the pearl-border fritillary, with a wingspan of around 50-60 millimetres. The upper side of its wings is mainly orange-brown in colour with black markings and a row of pale yellow spots near the outer edges. The underneath of its wings has patches of different colours to provide camouflage when the butterfly closes its wings to rest.
Both butterflies go through four life stages: egg, caterpillar, chrysalis, and adult butterfly. The larvae of the pearl-bordered fritillary eat the leaves of violet plants, while the larvae of the high brown fritillary eat bracken. Adults from both species are active during the summer months, eating nectar from various flowers. Both butterflies are listed as priority species under the UK Biodiversity Action Plan, and both have suffered from falling numbers due to habitat loss, fragmentation, and changes in how the land is managed. Efforts to protect these butterflies include maintaining open woodland areas, creating suitable clearings, and making sure there are enough plants for the caterpillars to eat.