Big Headlinemaker News Today

Habitat is home to rare blue butterflies. that fire is also endangering the palmers chipmunk only found in that area. and heat warnings are posted for most of the u.s. in the east. tens of millions are going to feel the extreme heat this week. temperatures well into the 90s. abcs ginger zee reports. >> reporter: as the northeast and mid-atlantic are bracing for a serious summer sizzler, the heat is proving dangerous. in portland, maine, five marathon runners hospitalized with heat exhaustion. ...