Toxic caterpillars have been spotted in a busy Brockley park and here is what you need to know about these horrible creepy-crawlies.

In the I Love SE4 group on Facebook a woman posted to warn residents about toxic OPM (oak processionary moth) caterpillars in HIlly Fields.

She said: “I've just heard from the cafe at hilly fields that the oak trees in front the cafe have these toxic OPM caterpillars so avoid at all cost. These caterpillars can cause bad skin rashes, respiratory problems, vomiting, toxic shock.

“The cafe have been on the phone to get them exterminated asap as the caterpillars fell out of the tree onto the benches in the front.”

The tiny hairs that cover their bodies can cause skin and eye irritations, sore throats and breathing difficulties. They can also affect dogs.

Some people have also been violently sick after coming into contact with the insect and some have suffered toxic shock.

The Forestry Commission says these oak processionary moth caterpillars feed on oak leaves and large populations can strip trees bare.

OPM caterpillars are recognised by their habit of moving about in late spring and early summer in nose-to-tail processions.

If you are worried about your trees, look out for distinctive white, silken webbing nests on trunks and branches.

Even if the caterpillars are dead, you should not touch them as they are still highly toxic.

What do they look like?

The OPM caterpillars have very long, white hairs (each caterpillar has around 65,000) which shed and can be active for up to five years.

How do you stay safe around such creepy-crawlies?

Do not touch or approach nests or caterpillars.

Do not let children touch or approach nests or caterpillars.

Do not let animals touch or approach nests or caterpillars; or try removing nests or caterpillars yourself.

What should I do if I see some?

If you think you have found a nest of OPM caterpillars then you should email the Forestry Commission on opm@forestry.gsi.gov.uk and they will begin treating the affected areas.