science news 19.12.2018

Today's round-up of science stories. Links are normally to press releases on EurekAlert. I include quotes from the summary in cases where the title alone doesn't reveal what the story is about:

astrobiology & astronomy

Space telescope detects water in a number of asteroids


behaviour

Dive-bombing for love: Male hummingbirds dazzle females with a highly synchronized display



Photo by Noah Whiteman, University of California, Berkeley


climate & environment

A new model of ice friction helps scientists understand how glaciers flow



ecology & conservation

Red wolf DNA found in mysterious Texas canines


Recruiting ants to fight weeds on the farm


senses

Researchers find gender separation affects sense of smell - in mice