Noctule bats, Britain's largest bat species, face welfare challenges from loss of roosting trees, light pollution disrupting foraging behaviour, and pesticide reduction of their insect prey.
Noctule bats experience welfare harms from both habitat and environmental degradation. Loss of mature trees with suitable cavities removes roosting habitat. Light pollution from street lights, commercial buildings, and sports facilities disrupts the emergence timing that protects bats from predators and maximises insect availability. Pesticide use reduces large flying insect abundance, causing nutritional stress. Road casualties during low foraging flights are documented. Cold roost temperatures during prolonged winter cold snaps can disrupt hibernation, causing bats to burn fat reserves without feeding. Retaining roosting trees and reducing light pollution around bat roosts provides direct welfare benefits.