Here's why:

* Appearance: Juniper webworms are small, brown caterpillars that resemble miniature pine cones. They often build silken webs around the branches of juniper trees, which can look like tiny pine cones themselves.

* Diet: Juniper webworms feed on the needles of juniper trees, causing significant damage. This is consistent with your observation of them eating your junipers.

* Habitat: Juniper webworms are common pests of juniper trees, making it a likely culprit.

However, it's essential to be certain before taking any action.

Here's what you can do to confirm your suspicion:

* Examine the webs: Check if the webs are silky and contain small, brown caterpillars.

* Look for signs of damage: Juniper webworms will leave behind brown, dead needles.

If you confirm the presence of juniper webworms:

* Control methods: You can control juniper webworms using insecticide sprays, but consult a local nursery or pest control professional for advice and guidance.

* Prevention: You can help prevent juniper webworms by keeping your junipers healthy and well-nourished.

Remember: It's always a good idea to identify pests accurately before applying any control measures.