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Marissa Parrott

Marissa Parrott

Senior Conservation Biologist at Zoos Victoria, Honorary Fellow at the University of Melbourne, and Vice President of the Australian Mammal Society.

Oct 16, 2026

4:23
Given that we need them to not only be in these numbers, but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:10
We'll, we'll get a reprieve if people are getting a bit sick of seeing the Bogong moths after the last few weeks, but the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
4:23
Given that we need them to not only be in these numbers, but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:15
But, uh, the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
0:51
Doctor, firstly, why are there so many Bogong moths around this year?
0:55
Well, the Bogong moths are such an amazing species, and this is how nature should be.
1:01
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead, and then their numbers have been lower more recently.
1:13
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:22
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:29
One is that following their collapse of 99.5% in 2017 and 2018, uh, their numbers have been growing every year since then on our Moth Tracker website.
1:42
So hopefully that means that as those numbers grow, they can m- reach that critical mass and become healthy again.
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
0:51
Doctor, firstly, why are there so many bogong moths around this year?
0:55
Well, the bogong moths are such an amazing species and this is how nature should be.
1:01
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead.
1:09
And then their numbers have been lower more recently.
1:13
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:22
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:29
One is that following their collapse of 99.5% in 2017 and 2018, their numbers have been growing every year since then on our Moth Tracker website.
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do we therefore need to be extra careful if we are relocating these moths if they're inside and doing as much as we can to safely get them at least back outside?
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:10
We'll, we'll get a reprieve if people are getting a bit sick of seeing the Bogong moths after the last few weeks, but, uh, the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
4:23
Given that we need them to not only be in these numbers, but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:15
But the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
0:51
Doctor, firstly, why are there so many bogong moths around this year?
0:55
Well, the bogong moths are such an amazing species and this is how nature should be.
1:01
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead.
1:09
And then their numbers have been lower more recently.
1:13
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:22
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:29
One is that following their collapse of 99.5% in 2017 and 2018, their numbers have been growing every year since then on our Moth Tracker website.
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do we therefore need to be extra careful if we are relocating these moths if they're inside and doing as much as we can to safely get them at least back outside?
1:06
Doctor, firstly, why are there so many bogong moths around this year?
1:10
Well, the bogong moths are such an amazing species and this is how nature should be.
1:16
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead.
1:24
And then their numbers have been lower more recently.
1:28
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:37
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:44
One is that following their collapse of 99.5% in 2017 and 2018, their numbers have been growing every year since then on our Moth Tracker website.
4:38
Given that we need them to not only be in these numbers but make it to the alpine regions, do we therefore need to be extra careful if we are relocating these moths if they're inside and doing as much as we can to safely get them at least back outside?
4:23
Given that we need them to not only be in these numbers, but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:15
But the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
4:23
Given that we need them to not only be in these numbers, but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:10
We'll, we'll get a reprieve if people are getting a bit sick of seeing the Bogong moths after the last few weeks, but the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
0:51
Doctor, firstly, why are there so many bogong moths around this year?
0:55
Well, the bogong moths are such an amazing species and this is how nature should be.
1:01
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead.
1:09
And then their numbers have been lower more recently.
1:13
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:22
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:29
One is that following their collapse of 99.5% in 2017 and 2018, their numbers have been growing every year since then on our Moth Tracker website.
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do we therefore need to be extra careful if we are relocating these moths if they're inside and doing as much as we can to safely get them at least back outside?
1:21
Doctor, firstly, why are there so many bogong moths around this year?
1:25
Well, the bogong moths are such an amazing species and this is how nature should be.
1:31
People remember from the past them being in such big numbers that they would block out the stars and the moon as they went overhead.
1:39
And then their numbers have been lower more recently.
1:43
So seeing their numbers return to such healthy sizes is a real positive for what is an endangered species.
1:52
We're not sure why their numbers are so much better this year, and there are quite a few potential reasons.
1:59
One is that following their collapse of 99.5% in 2017 and 2018, their numbers have been growing every year since then on our Moth Tracker website.
4:53
Given that we need them to not only be in these numbers, but make it to the alpine regions, do we therefore need to be extra careful if we are relocating these moths, if they're inside and doing as much as we can to safely get them at least back outside?
4:23
Given that we need them to not only be in these numbers but make it to the alpine regions, do, do we therefore need to be extra careful if we are relocating these moths if they're inside and, and doing as much as we can to, to safely get them at least back outside?
4:39
We do indeed.
4:40
Every moth is precious.
4:42
A female Bogong moth can lay 2,000 eggs and have 2,000 youngsters, so that can really help the population to rebound and recover.
4:52
We certainly don't want any Bogong moths stuck inside.
4:56
They are harmless.
4:57
They're gentle.
6:10
We'll, we'll get a reprieve if people are getting a bit sick of seeing the Bogong moths after the last few weeks, but the question, uh, I guess on many people's minds is, is this back, uh, to what we've seen in the past? Can we expect them in similar numbers next year, or is it just too soon to tell?
1:08
How much longer are they going to stick around for?
1:11
Well, they are on their great migration now, heading 1,000 kilometres up to the Alps, and that can take days to weeks.
1:19
It could even be them coming through over the next few months, but they won't stay long.
1:24
They'll just continue their migration up to those nice, cool caves, to the species that rely on them, like the critically endangered mountain pygmy possums.
1:33
Enjoy them while they last, while they have a quick feed, and then they will head on by themselves.
1:38
OK, so are we going to see another wave
1:40
or this is just one big wave?
1:42
Sometimes you see waves across the season, but we don't know exactly what causes their different travel routes, their different timing.
PaulHOST
1:35
How many of them are there in this, uh, swarm or migration? Uh, there seem to be several hundred in my house at the moment.
1:43
Well, please take a photo of those, Paul, and log them on our Moth Tracker website because we're trying to work out exactly how many moths there are.
1:52
In the past, around four billion would migrate every year, but back in 2017 and 2018, their numbers collapsed by around 99.5%.
2:05
It was absolutely shocking and terrible not only for the bogong moths but the animals that rely on them up in the alpine zone, like the critically endangered mountain pygmy possums.
2:15
Their numbers have been increasing since 2019.
2:19
On Moth Tracker, we've seen them increasing each year, and the last two years were the best.
2:25
This year has just blown them out of the water.
PaulHOST
3:37
And why the sudden bounce back in numbers this, this year and the previous year?
70:36
There seem to be several hundred in my house at the moment.
70:39
Well, please take a photo of those, Paul, and log them on our MothTracker website because we're trying to work out exactly how many moths there are.
70:49
In the past, around four billion would migrate every year, but back in 2017 and 2018, their numbers collapsed by around 99.5%.
71:01
It was absolutely shocking and terrible not only for the bogong moths, but the animals that rely on them up in the alpine zone, like the critically endangered mountain pygmy possums.
71:12
Their numbers have been increasing since 2019.
71:16
On MothTracker, we've seen them increasing each year, and the last two years were the best.
71:21
This year has just blown them out of the water.
72:33
And why the sudden bounce back in numbers this, this year and the previous year?
14:42
What else do we know about the migration? Where are they headed? Why are they going there?
14:47
Oh, we're so excited to see all of the numbers that are coming through on our website, MothTracker, that everyone's sharing.
14:54
They're flying from their breeding grounds, which are around Southern Queensland through New South Wales, Western Victoria, South Australia even, and they're making this great migration a thousand kilometers up to the Alpine zone, where they will spend their summers in nice cool boulder fields and caves to escape the heat.
15:14
After that, they will then migrate all the way back again in autumn, where they will breed, lay their eggs, and then die.
15:22
They only live about a year, so it's such a huge journey for a tiny moth.
15:28
It's such an important journey, too.
15:30
Along their migration path, they pollinate all of the plants.
18:57
Who knew? Are there any programs happening to try and replenish these numbers? Is there anything we can do in our day-to-day to try and boost the population of bogong moths going forward?
28:57
What do they serve a purpose?
29:00
They're beautiful, gentle animals that are so important.
29:03
You're right, they don't sting, they don't bite, they don't eat clothes.
29:07
They don't cause any damage.
29:08
They're actually really important pollinators.
29:11
And every year, particularly across Southeast Australia, although they are found in other states and territories, they will migrate up to 1,000 kilometres from their breeding grounds up to the Alps where they spend the summer.
29:25
And then they migrate up to 1,000 kilometers back again.
30:00
So you've now got a moth tracker, which I assume is to do with the big, big dip in population of the bogong moths that you saw a few years ago, and you want people to send pictures in.

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