Climate change has resulted in many plant species moving an average of 29 metres uphill every decade. Climate change has caused plants to seek cooler conditions at higher altitudes. Smaller species such as ferns, which have shorter reproduction cycles, were the quickest to relocate. This suggests that long living woody plant species, such as trees, are likely to be more threatened by climate change than herb species like grasses. "This may imply profound changes in the composition and structure of plant communities and animal species that depend upon them."