Grounded Trees & Ecology

Grounded Trees & Ecology Arboriculture and ecology company based in Swansea. Bat and other ecology surveys, plus tree works.

20/08/2025

You like eating bugs, don't you, Chiroptera? 🦋

Let's talk aerial hawking - a behaviour in flying predators in which prey is pursued and caught mid-flight, just like here! Poor little moth didn't stand a chance against this brown long-eared.

We're keeping busy at the end of this bat season! It flies by so quickly 🦇

05/08/2025

What do bats get up to in August?

At this point in the year, maternity season is coming to an end, juveniles are leaving maternity colonies and finding their own roosts, and mothers are leaving and transitioning to mating roosts. Bats will mate in the coming weeks and months, and females will store s***m throughout the winter months and hibernation, before becoming pregnant when they emerge from hibernation next spring.

31/07/2025

I wonder why they're called long-eared bats...? 🤔

Come with us on another PRA.Last week, we made a post looking at a property with negligible bat roosting potential in a ...
29/07/2025

Come with us on another PRA.

Last week, we made a post looking at a property with negligible bat roosting potential in a built up suburban area. This is a property in a similar area - suburban, surrounded by residential homes, though this property has parks with lakes nearby.

Unlike the property we posted about, which had very limited access points, this building had access points on all of its aspect, most notably, under the soffits. The loft space is unused and undisturbed, and a breeze could be felt through it. This indicates that there are many little gaps in the roof area bats could use to gain entry to the loft, and the bat droppings we found inside the loft confirms that bats have found their way into the property.

Our next steps would be to figure out what gaps the bats are using to get into the property. We would achieve this through emergence surveys, setting up cameras around the property to record exactly when, where, how many, and what species of bats are emerging.

On a confirmed bat roost, guidelines suggest three emergence surveys spaced apart by three weeks. If you have been asked for a bat survey by your LPA, you have until the end of August to get these surveys done this year. Get in touch so we can squeeze you in before it is too late this season!

We've made a few posts recently involving the Bat Roost Trigger Index and how we are using it on our Preliminary Roost A...
24/07/2025

We've made a few posts recently involving the Bat Roost Trigger Index and how we are using it on our Preliminary Roost Assessments to support our professional judgement when it comes to assessing bat roosting suitability.

So, come on this recent PRA with us, have a look at what we found, what the planned development, and decide for yourself - what do you think the bat roosting suitability of this property is? What would you recommend for the next steps?

If you've been asked for a bat survey, get in touch before the bat season is over to secure planning permission this year!

22/07/2025

Come with us for a bat ecologist's idea of a magical evening! 🦇

How many mums do you think we counted out of this feature? 👀

A comparison of survey results from the same site, a month apart 🦇Official guidance on bat surveys recommends that your ...
18/07/2025

A comparison of survey results from the same site, a month apart 🦇

Official guidance on bat surveys recommends that your surveys are spread apart by at least three weeks. The reason they are spaced apart is because bats change roosts and use structures for different purposes at different times throughout the year. So, at the beginning of the season, we had a day roost for a few individuals, and further into the season, we had two maternity colonies, one for brown long-eared bats, and one for Natterer's bats. Spreading apart our surveys allows us to get a full and thorough idea of how bats use a building over an entire season, and helps minimise the risk that we miss anything important (like two maternity roosts!). We wonder what we'll find on our third and final survey to this site 👀

With the end of the season only about a month and a half away, now is the time to start your surveys before the window is missed for this year! Please get in touch to see how we can help.

09/07/2025

1 Become 2, or whatever The Spice Girls said.

This week, we got to go back to this phenomenal roost that hosts a minimum of three species of bats - brown long-eareds, Natterer's, and pipistrelles. When we came back for a second visit, we discovered TWO MATERNITY ROOSTS ! This one is the maternity roost we discovered for Natterer's bats which leads into a sheltered barn where the mums can forage safely, and the youngsters can learn to fly without fear of predators.

We are so excited to go back and endoscope these features in a few weeks time! Stay tuned for more footage we collected during this visit 👀 🦇

04/07/2025

The hardest part of our jobs - bats are small; buildings are big. Our eyes are good, but the dark and the size of the buildings we survey make the relatively tiny bats easy to miss. Often, we notice a bat after it has emerged from the building only after it is standing out against a much clearer background. This is where our cameras come in. They capture every second of the evening survey, allowing us to review footage at times we have spotted bats, and zoom in so we can confirm if the bat has come from the building, and where exactly it has come from. We've been using specialist infrared camera equipment for years, but have been enjoying incorporating thermal cameras into our regular survey set up this year.

Do you need a bat survey this season? Let us know and we can book you in for a survey (and our funky thermal cameras)!

02/07/2025

In July, bat mothers have likely given birth, and are nourishing their young within maternity colonies.

Maternity colonies are formed with many bats - sometimes hundreds! We can identify maternity colonies during our roost characterisation surveys by getting a count of bats emerging from the building, and by observing whether bats will re-enter their roosts following emergence. Mothers will often return to their roosts multiple times throughout the night between foraging to suckle their young.

Review an evening of emergence footage with us  🦇Our infrared cameras are set up, recording buildings all night, so that...
30/06/2025

Review an evening of emergence footage with us 🦇

Our infrared cameras are set up, recording buildings all night, so that when we spot a bat emerging, we can review the footage at that exact time and pinpoint precise bat active points - like these ones! On this survey, we only recorded two bats emerging from the building, but will be returning within the next couple of weeks to see if that number has changed, and if we can spot any additional access points.

Do you need a bat survey this season? Get in touch and we can book you in!

Address

4 Spion Kop Road
Swansea
SA65AN

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