A nonprofit whose south Texas butterfly preserve stands in the way of a planned border wall called for a federal judge Monday to hinge construction on the results of an environmental assessment.

More than 300 species of butterflies have been documented in the Valley and nearly half of those don’t occur any farther ...

There are two wildlife populations of migrating monarch butterflies in North America: those east of the Rocky Mountains, which fly over the Southwest border — most through South Texas — to ...

Explore the worrying decline of Monarch butterflies in Texas and the implications for pollination and food production. Learn why preserving these butterflies is vital for a sustainable ecosystem.

Only 24 populations of the plant survive, in south Texas and northern Mexico, where they serve as an important food source for pollinators like bees and imperiled monarch butterflies. The Service also ...