In tropical areas zombie ants bite leaves, but in temperate regions they bite twigs or bark
How zombie ants adapted due to climate change - science news in short

Zombie ants are species of carpenter ants that have been infected with a fungus. In order to spread, the fungus manipulates the ants to climb on a tree where they remain fixed after biting a leaf or a branch. Fossil zombie ants found in Germany show that in the distant past they used to bite the leaves in regions that were, at that time, evergreen. They do the same now, in tropical regions where trees do not loose leaves. However, the zombie ants that live in temperate climates have evolved to bite twigs or bark, instead of leaves. This behavior allows them to stay fixed longer and spread the fungus more efficiently.

Read the full story: EurekaAlert
Scientific publication: Evolution