Pine Processionary Caterpillars in Mallorca: Season, Risks and How to Respond
The caterpillars of the pine processionary moth are visible in winter and spring. Keeping your distance and acting calmly can greatly reduce the risk.
Pine processionary caterpillars in Mallorca are one of the nature-related hazards to be aware of when walking through pine-covered areas between winter and spring. It is not the moths but their hairy caterpillars that can cause unpleasant or even serious reactions on contact—especially in dogs and young children.
There is no need to avoid pine forests altogether. The key is recognising nests and caterpillar trails, keeping your distance, and not delaying if contact may have occurred.
When pine processionary caterpillars are active in Mallorca
Over winter, the caterpillars develop in distinctive whitish, silky web nests in pine trees. Towards the end of winter and during spring, they leave the trees to pupate in the ground. This is when they are often seen moving in long, characteristic lines—hence their name.
You are most likely to spot them in pine and conifer stands, such as along forest edges, on rural paths, in larger gardens or in natural landscaped areas. Their exact period of activity varies according to weather and altitude; mild spells can speed up their development.
Why the caterpillars can be a problem for dogs and children
The caterpillars’ fine urticating hairs contain an irritant and can easily become lodged in the skin, mucous membranes or eyes. Old nests and shed skins left behind may still contain hairs as well. Typical symptoms include itching, redness, rashes or respiratory irritation.
For dogs, sniffing, licking or picking them up is particularly risky: the mouth and tongue can swell severely and react painfully. Children should never touch caterpillars or nests, or poke at them with sticks.
Local insider tips
Look ahead on pine-lined paths
Watch not only the tree canopy but also the edges of the path. Caterpillar trails can slowly cross paths and open areas.
Keep your dog on a short lead
In pine-covered areas, using a short lead during the season is the simplest precaution. It helps prevent your dog from sniffing something unfamiliar.
Check your picnic spot
Before sitting down beneath pine trees, take a quick look up and at the ground. If you can see web nests, choose a different spot.
How to respond to possible contact
Keep your distance, put your dog on a lead and leave the area without disturbing the caterpillars or nests. Carefully rinse affected skin with plenty of water without rubbing; if the eyes are affected, thorough rinsing is important. Seek medical advice if there are significant skin, eye or breathing reactions.
If a dog has had contact in its mouth or shows heavy drooling, swelling, pain or breathing difficulties, it needs immediate veterinary care. Do not try to remove nests yourself: on private property, leave this to qualified professionals; in public areas, inform the relevant municipality or park authority.