Welcome to the Essex Bat Group website
If you find a bat in need of rescue please click on the ‘Bat Rescue‘ tab above and you will find contact details and advice.
What are bats up to in April and May?
Bats are now active on all but the coldest nights. When insects are flying, they will be actively foraging. If there’s a cold spell, they will return to a torpid state until it’s warm enough to feed again.
This a period of mating and the beginning of pregnancy for many adult female bats (through the re-activation of sperm stored since autumnal mating or by way of spring mating). April is a time of transition when bats often change their more settled winter hibernation sites for temporary roosts and when females begin to return to often long-established maternity roosts in which they form colonies.
May is a busy month for bats, particularly females who are finding suitable nursery roosts and establishing their maternity colonies. For pregnant bats, gestation will last for 40-50 days in smaller species and up to 70 days in lager bats. In exceptionally favourable years, females begin giving birth before the end of the month, but most babies arrive from mid-June onwards. Males will be largely separate in their own roosts (individually or in small groups) and are not involved in the raising of young.
Bats will be active most nights but will still occasionally return to periods of extended torpor during cold spells.
If you find a grounded bat or are concerned about a bat’s welfare, then please refer to the Bat Rescue tab above.
Who are Essex Bat Group?
We are an active voluntary group passionate about the conservation of bat species, their roosts and foraging habitat within Essex, UK. Our activities include survey, research, rescue and care and providing advice and information. More details are provided under the ‘About’ tab.