Alva Review-Courier -

AMES, Iowa (AP) — On a hot and humid May day, more than 50 workers busily clear honeysuckle and buckthorn from Ada Hayden Heritage Park in Ames.

These aren't your typical summer temps — college students riding out break on top of lawn mowers.

These workers have four legs and an appetite for Iowa's invasive weeds.

Iowans are increasingly turning to goats to fight the state's widespread problem with invasive species.

In Ames, the herd was hired to chew back the broad leaves of woody vegetation that has invaded what once was an oak savanna on the northern edge of town.

The low-tech approach is a...