butterfly

davidyuweb / flickr

Ecologists in Kansas and Missouri say extreme temperatures are killing a large number of butterflies and could hurt their southern migration next month.

Millions of monarch butterflies are expected to migrate south through the two states in less than a month in their seasonal trip from Canada to Mexico.

KSHB-TV reports the Powell Botanical Gardens annual butterfly festival east of Kansas City is seeing the lowest number of monarchs in a decade.