Serra de Mariola, Spain - Butterflies September 2025

In September we took a week's holiday to the south of Spain, staying in a hotel in the mountains above Benidorm. I didn't go with any great expectations of seeing many butterflies, but I hadn’t realised quite how few there would be there. Despite the hotel having a large golf course around it, plenty of flowering shrubs and the roads in the area having irrigated trees along the pavements there were very few butterflies around.

All I managed to see was a couple of Long-tailed Blues and Lang’s Short-tailed Blues on some Dittrichia viscosa, known as False Yellowhead, growing near a roundabout.

There were some lovely Lantana bushes growing next to the road, which I thoroughly checked. Although there were plenty of insects including little black and white bees, and some moths, there were no butterflies. 

Back at the hotel a lone Geranium Bronze, Cacyreus marshalli, flew past, but sadly there was no sign of them on any of the numerous Geraniums.

So, one day I rented a car and drove up into the mountains to the Parc Natural de la Serra de Mariola, about 40 kilometres inland. I chose this area by looking on Google maps for a green area with north-facing slopes.

The scenery was much greener in the mountains and as soon as I arrived I spotted butterflies from the car. A couple of times I jammed on the brakes and jumped out to go after them! They turned out to be Small Whites and Cardinals, Argynnis pandora.

Eventually, I arrived at the spot I had chosen - the Area Recreative Font de Mariola. It was actually my second choice of location as in my panic to set my sat nav after picking up the car I clicked on a slightly different location from where I intended. I had intended to walk along the Vinalopo River along the advertised blue walking route.

I parked under a tree in a small car park with some picnic benches. There was a small irrigation channel running below the car park and a green area of grass and wild flowers next to it. On a patch of Lucern next to the water there were a number of Lang’s Short-tailed Blues, Leptotes pirithous,

... and Long-tailed Blues, Lampides boeticus, feeding. 

Flying along the grass was a white butterfly which turned out to be a helice form of the Clouded Yellow, Colias croceus.

Just above the car park I spotted a Wall Brown, Lasiommata megera, flying.

I decided to walk down a track through an area of Pine trees. There was scrub and wild flowers growing below them. Off to the side I saw a small white butterfly, which I quickly realised was a Wood White, Leptidea sinapis. It flew from flower to flower, not stopping for more than a second at each. I followed it as best I could hoping that it would settle for a while. All I could manage was a slightly over-exposed picture.

By this time I was some way off the track and I found a smaller path, which had a lot of butterflies flying along it. There were loads of blues, which mostly turned out to be Adonis Blues, Polyommatus bellargus.

I have only seen an Adonis Blue a couple of times before, but here I must have seen about 15 or 20 of them.

Afterwards I noticed that one of my pictures was of a Southern Blue, Polyommatus celina.

There were quite a number of brown butterflies flying around there, too. Most of them were very worn-out Cardinals, which seemed to chase after any other butterflies they encountered.

There were a few Tree Graylings, Hipparchia statilinus, the first time I have seen this species.

One or two Rock Graylings, Hipparchia hermione, another new species for me! 

And some Striped Graylings, Hipparchia fidia.

There were quite a number of Wall Browns and two Small Coppers, Lycaena phlaeas. 

Also two Sage Skippers, Muschampia proto, one very worn out and the other very 

fresh-looking.

On my way back I also spotted a female Wood White and a “normal” yellow form of Clouded Yellow. This was the only yellow one I saw compared to six or seven of the helice form.

I was so pleased that I had made the effort to drive away from the coast and up into the mountains. I am always delighted to see butterflies when I am on holiday and those that I saw this time were a little different from what I have seen in other areas of Spain. 

Back at the hotel on our last day I went for another walk along the roads around the hotel. There was just a Lang’s Short-tailed blue on the False Yellowhead patch and then out of the corner of my eye I thought I saw something land on a shrub close by. I zoomed my camera right in to the branch where I thought it landed and spotted a little face!

It looked like a skipper of some sort, so I braved the thorns and strange looks from passing motorists and scrambled into the vegetation! I managed to get a picture from the side and then confirm that it was a Mediterranean Skipper, Gegenes nostrodamus.

We didn’t have to leave the hotel until 3pm, so spent the day sitting by the pool. Strangely, I saw a Swallowtail fly past on three occasions and in a garden area there was a Two-tailed Pasha flying around the trees.

I had been pondering on why there were so few butterflies around, all along the coast. I remember reading that in Costa Rica many species migrate up into the mountains during the dry season and I wonder if something similar happens in Southern Spain. There were areas of green in the hills around the hotel and there were plenty of flowering plants in the hotel, along the roads and in parks. Maybe it is just natural that butterflies leave the coast in the hotter months and not the result of all of the development in the area.

Of Caterpillars and Chrysalises Part 2

Continued from my previous post.

I can’t believe the number of eggs I have found this year of Large Whites, Small Whites and Green-veined Whites. There have been a lot of adults flying around and my Nasturtiums have been covered in eggs. 

The Large White lays its eggs in batches on the underside of the leaves.

The other two species lay their eggs individually anywhere on the plant. They have also been laying eggs on a Rocket plant growing in our patio and on Bittercress and Garlic Mustard.

I tried to photograph some Large White eggs and various stages of their development as caterpillars, but there were so many different batches of eggs I couldn’t keep track of which were which.

There were so many caterpillars that some of the Nasturtiums were completely stripped of leaves. I tried to pick leaves from other plants, but discovered that most of them had new batches of eggs on them. So, I resorted to buying bags of Curly Kale to try to keep the caterpillars alive! I have never seen so many caterpillars!

Once they were ready to form chrysalises they crawled up the wall of the house to find a sheltered spot.

Unfortunately, a few were parasitized by Braconid wasps. Presumably the adults had laid eggs inside the caterpillars at some point and the larvae burst out of the chrysalises to pupate.

And the Bluetits learned where to look for the caterpillars, flying up to the wall and picking off the chrysalises. Even the chrysalises that I had thought were safe were picked off by wasps, biting into the chrysalis and managing to prize them off the wall! I was feeling a bit despondent, seeing so many chrysalises perish after I had put the effort in to save the caterpillars. 

However, I needn't have worried. One day I noticed a Small White butterfly emerging from under the Alpine trough. I had a look underneath the trough and there were several more Small White chrysalises under there.

During the late summer/early autumn there have been loads of Large Whites, Small Whites and Green-veined Whites flying around.

On 12th July I noticed a hutchisonii form of Comma laying eggs on the nettles behind my garage. I wasn’t able to look for the eggs for fear of being stung, but on the 7th August, I was walking past the garage when I spied a little face peeking out from below a nettle leaf. It was a Comma caterpillar.

I watched it for a few days and on the 10th August it formed a chrysalis.

Unfortunately, it is now the end of September and nothing has emerged from the chrysalis, so I fear it may have failed.

I was down in my meadow one day in August, when I noticed a nettle bouncing around. I couldn't understand why it was moving like that on a still day. On closer inspection I noticed that the top leaves were stitched together and on top of the leaves was a parasitic Ichneumonid wasp.

I chased the wasp away and investigated further and found a Red Admiral chrysalis inside the nettle leaves. A little later when I walked back the nettle was bouncing around again and the wasp was back. So I decided to pick the nettle and put it in a mesh cage. I thought that in a few weeks I would either have a Red Admiral or a number of wasps! Luckily it was a Red Admiral that emerged from the chrysalis about three weeks later.

I don't think I have ever known such a good year for finding caterpillars and chrysalises!

Of Caterpillars and Chrysalises

So far this year has been amazing for butterflies, but not only in their adult form. I also seem to have come across quite a few eggs, caterpillars and chrysalises.

It is always fun searching for Orange Tip eggs and caterpillars on Garlic Mustard and Cuckoo Flowers. This year they seemed to be on just about every flower spike I saw. This is a group of freshly laid eggs on a Cuckoo Flower.

In a couple of days they turn bright orange. I followed one egg with interest, which had been laid on a Garlic Mustard near the house. This was the caterpillar a couple of days after it had hatched.

The egg hatched on 11 May and I watched it develop until the 17 June when it formed a chrysalis. This is another caterpillar preparing to form a chrysalis.

And another one that unusually is about to form a chrysalis head down.

This is the chrysalis of the caterpillar I reared. It seems strange that it will remain in this state until April next year. 

On 13th May I saw a Green-veined White laying eggs on the leaves of a Garlic Mustard plant.

The eggs hatched on the 21st May and the caterpillars developed until the 30th June when they formed chrysalises.

On the 9th July both chrysalises emerged.

I have found three batches of well developed Peacock caterpillars amongst the nettles here. I haven’t noted the dates of any of these, as I didn’t know when the eggs were laid, or when the caterpillars formed chrysalises. However, on 3rd July I was demolishing an old shed and discovered a mature Peacock caterpillar on a piece of wood I had ripped off. Luckily it wasn’t injured, so I put it into a mesh cage, where it crawled to the roof and hung in a “J” shape.

Two days later it was still hanging there, but I noticed a 3pm it had moulted and formed a lovely green chrysalis.

This changed colour over the next few days and on 22nd July it emerged.

Sadly, it didn’t stick around for an open-wing photograph!

On the 5th July I was walking up our drive when I noticed a Red Admiral caterpillar crossing in front of me. Of course I collected it up and put it in a cage, where it immediately went to a Garlic Mustard plant and started stitching together the edges of a leaf to form a tent. The next day I noticed it had formed a chrysalis. I wasn’t very hopeful of a positive outcome, as I thought it unusual to find the caterpillar out in the open like that, as they usually hide away inside leaf tents. However, on the 22nd July it emerged, the same day as the Peacock. 

It was a lot more cooperative and allowed me to take some pictures of it before it flew off!

I have seen a lot of Red Admiral caterpillars and chrysalises in the nettles in our garden. There are a lot of adults flying around so hopefully they will soon be joined by more.