Recording moths with our homemade moth trap

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I think Amy was feeling a bit sorry for me. I’d been heading into the garden each evening with a headtorch and a butterfly net in search of elephant hawk moths.

But despite my best efforts, they had given me the slip.

Apparently, Amy had noticed my “crepuscular activity” on more than one occasion in the weeks leading up to ordering the parts for our homemade moth trap.

Around this time last year, someone in the next village along showed me a photo of one on their phone. They really are spectacular, with their furry, tan-coloured body and bright pink markings. The thought of them flying around our garden at night really excites me.

But our small village is surrounded by ecologically simplified fields of intensively farmed cereal crops.

Our home sits in a vast agricultural landscape (as do most non-urban homes in Britain). As a result, ecosystems become fragmented and lose resilience.

The hawk moths may be happy down the road, but can they cross this ecological desert? If not, are there enough homes with well-planted gardens in our tiny village to support them?

“Let’s make a moth trap, Joey. I’ll order everything we need,” Amy told me at the end of June. So she did.

Moth traps are really easy to make

Considering how expensive moth traps are to buy (you can easily pay over £200.00), making one is actually very straightforward. Amy found excellent instructions from Butterfly Conservation, which we followed to the letter.

A moth trap is essentially a big bucket with an equally massive funnel on top and a light bulb above both (bulbs that emit UVB are considered best). So despite neither of us being especially DIY savvy, we were able to cobble something together.

I’ll make a video on how to build your own moth trap very soon.

One of the last steps in making our moth trap was attaching the bulb holder. Amy held it in place while I marked the drill holes.

Setting out the moth trap, but not feeling especially hopeful

I have to say, Amy never had any doubts that our homemade moth trap would work well. I, on the other hand, wasn’t so sure.

I couldn’t get my head around how the moths would end up in the bucket below. Surely they would just fly into the bulb repeatedly all night long until they ran out of energy or knocked themselves unconscious (can moths get concussed?). But as the sun was setting, we placed the trap on the lawn next to the naturalistic border and headed in for the night.

Despite the light drizzle, a few hours later, we noticed lots of flying insects darting for the bulb. This was promising, but still, I didn’t want to get my hopes up.

As the sun set, we placed our homemade moth trap on the lawn next to our naturalistic border.
A few hours later, despite the drizzle, a whole host of night-flying insects could be seen flying around the terrarium bulb we’d used on our homemade moth trap.

Yet the following morning… moths galore!

Upon opening the moth trap the following morning to inspect our “catch”, I felt genuine relief. The blue egg boxes we’d used as landing spots for the moths were well populated with a great range of moths of all sizes.

This was the part Amy was most apprehensive about. Not keen on the idea of moths flying at her, she stood back as I carefully removed each cardboard egg tray.

But her nervousness was short-lived. The moths were fast asleep, seemingly oblivious to our presence or the daylight. These vulnerable, beautiful, immobile beings were reliant on us for safety and it was our responsibility to protect them from predation whilst they were in our care.

Among the catch were 10 elephant hawk moths, 2 small elephant hawk moths, a scalloped oak, a privet hawk moth, a pine hawk moth, a European June bug, and lots of other night-flying insects!

Our effort had been well rewarded.

Scalloped oak – Crocallis elinguaria
Privet hawk moth – Sphinx ligustri
Small elephant hawk moth – Deilephila porcellus
Comparison of a small elephant hawk moth (left) and a elephant hawk moth (right)
Elephant hawk moth – Deilephila elpenor
We think this is a pine hawk moth – Sphinx pinastri

Recording the moths that live in our garden

The reason we trapped all of these amazing insects is to record them. Recording which wildlife species are enjoying your garden is really valuable. It helps you to:

  • Understand which species live in your garden
  • Monitor changes in biodiversity over time
  • Measure the impact of your wildlife-friendly gardening practices
  • Identify rare or notable species
  • Contribute valuable records to local and national conservation projects
  • Help scientists understand species distributions and population trends
  • Learn more about the ecology of your own garden
  • Develop your observation and identification skills
  • Gain a deeper appreciation for the wildlife that shares your garden

Although we are not moth experts (Lepidopterist is apparently the term for those who are), our wildlife recordings are extremely valuable to specialist conservation groups.

We struggle to identify which species are which without our smartphones, although we’re getting better. But thankfully, the records that we make using the “iRecord App” are verified or adjusted by local experts, so it doesn’t matter if our identification is wrong. Plus the app will make a species suggestion based on your photos.

So if you’d like to start recording wildlife in your garden, don’t let inexperience be a worry. We’re all learning.

Releasing the moths the following evening

We read contrasting opinions on how and when to release the moths once they were recorded. Some said to place the moth-laden trap somewhere cool in the daytime, and release them at dusk, while others suggested releasing them the same morning, just after recording.

And while some articles said to simply open the moth trap and let the moths leave when they were ready, others said to place them on plants that would protect them from predators.

We decided to wait until the evening and place them on well-known “moth-friendly” plants around the garden, although some fluttered out as soon as we opened the trap, which reminded me a little of Pandora’s Box.

Releasing an elephant hawk moth onto Buddleja davidii

When will we trap again?

Even though recording our native wildlife is important, and I know we’ll be releasing them a few hours later, I feel bad about catching them. The moths would much rather carry on their lives without being trapped.

For this reason, we don’t want to set up the moth trap more often than needed. We definitely don’t want to risk catching the same individuals more than once. So we’re currently thinking that we’ll trap and record moths in our garden about once a month. This feels manageable for us and should mean we can build a year-round record of the night-flying moth species we share our garden with, whilst eliminating the “re-catching issue”.

What wildlife have you spotted in your garden recently?

I’m really interested to hear which wildlife species you’ve found sharing your garden.

And have you noticed bumper numbers of butterflies this year, or is it my imagination?

If you could leave a comment below, I’d be really grateful.

Thanks, and happy naturing 🦋

Joe

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  1. Comments

    Sarah Parker Avatar
    Sarah Parker

    Great find Joe!


    1. Comments

      Joe Vary Avatar

      Thank you Sarah!

      I hope you’re both well and your garden is attracting lots of wildlife.

      I also hope those rabbits are not causing too much trouble in your flower beds and orchard 🐰

      All the best,
      Joe


  2. Comments

    Renee Porter Avatar
    Renee Porter

    Very interesting Jo. Pleased to see a humming bird moth (I think) on the lavender. yesterday


    1. Comments

      Joe Vary Avatar

      Hi Renee,

      It’s great to hear from you. I had no idea hummingbird hawk moths fed on lavender, but funnily enough, I was in a client’s garden today and he told me that his lavender had been attracting hummingbird hawk moths too!

      So I’ll be keeping an eye on our lavender!

      Thank you for sharing your observation. It’s really helpful🙏
      Joe


  3. Comments

    Rachael Relton Avatar
    Rachael Relton

    Hummingbird Moth but during the day. We are hoping to build a moth trap soon ourselves in our childminder setting (near your Mum!)


    1. Comments

      Joe Vary Avatar

      Hi Rachael,

      Thanks so much for your comment 🙏

      It’s fantastic to hear about your hummingbird hawk moths. They seem to be doing really well this year; a few people have mentioned them recently.

      I noticed the first one of the year in our garden only this week when watering pots in the morning.

      My mam mentioned your work and it sounds amazing. I bet that the kids will really love making a moth trap, getting up close with the moths the next day, and learning how to record nature.

      Good luck with making the trap, and please do let me know how you get on!

      Happy moth trapping 🦋
      Joe


  4. Comments

    Angela Avatar
    Angela

    I’ve got a resident jersey tiger moth in the garden. It’s absolutely stunning. Very interesting read. Thanks


    1. Comments

      Joe Vary Avatar

      Thank you for the tip-off Angela.

      I’ve never seen a Jersey Tiger Moth, but I’ve just looked them up. Apparently they love Buddleja, which we have in our garden, so I’ll keep my eyes peeled.

      I’d be interested to know which plants they’re enjoying in your garden.

      Thank you,
      Joe


  5. Comments

    Hilary Avatar
    Hilary

    Thanks Joe. Wonderful to hear of the number of moths you trapped and so pleased you got to see Elephant hawk moth. I identified yesterday the peacock butterfly in my garden. I seem to have lots of them at the moment. I came across a giant hole in my lawn a couple of months ago and wondered what might have dug it. Any ideas?


    1. Comments

      Joe Vary Avatar

      It’s great to hear from your Hilary 😊

      Having peacock butterflies in your garden is amazing. I bet they’re enjoying your Buddleja in particular (I think I remember seeing some Buddleja last time I visited).

      The fact you’ve seen so many of them must mean that your garden is providing a great amount of butterfly food, which is fantastic.

      The hole in your lawn. Hmmm. It could be a few things, but due to the size of it, my money is on badgers.
      They dig holes to feed on insects that live underground. This can include (but isn’t limited to):

      Chafer grubs
      Leatherjackets
      Earthworms
      Bumblebee colonies

      Although it can be unsightly, and a trip hazard, I would welcome it. It shows that your garden is providing at least some of what the badgers need. Perhaps just fill the hole in and sow a bit of lawn seed on top.

      All the best,
      Joe


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