Over the next few weeks, Monarch Butterflies will be making their way from Canada though Texoma to Mexico where they'll breed over the winter.
But, the number of migrating butterfly are dwindling.
The Riverbend Nature Center says the first wave of butterflies has already come through, but it was smaller than expected.
Experts say its because of illegal deforestation of their breeding grounds in Mexico.
"If they start dying off in mass quantities, then something is wrong," said JJ White with the Riverbend Nature Center.
Entomologists suspect the butterfly migration has also been affected by climate change and new green energy technologies like wind turbines.