After years of spotted lanternflies being out in full force, their numbers have started to thin out – for multiple reasons, writes Emily Anthes for The New York Times.

Aggressive stomping efforts may have played a role in trimming the invasive insect’s population in the Philadelphia area in the last several years, but there are other factors as well.

The invasion of spotted lanternflies started with rapid population increases. However, over the years, the invasive insect has started getting natural enemies. Various species of birds, some spires, and even wasps might have learned that spotted lanternflies are a tasty meal. These predators could now be eating into the numbers of spotted lanternflies and keeping them in check. In essence, they are establishing a new ecological equilibrium.

“I think they’re just integrating into our ecosystem,” said Shauna Moore, Brooklyn Botanic Garden’s director of horticulture.

Additionally, the bugs might have moved on from some places after having exhausted their favorite foods.

However, scientists are warning that it is too soon to predict if the drop in numbers is permanent and how the spotted lanternfly invasion will further develop.

Read more about spotted lanternflies in The New York Times.