Above: Siberian elm samara in New York City. Like other fruit, nut, and winged seed trees (like maples), elms can have mast years, or a bumper crop, where branches appear to be bursting with ...

They feed on seeds from trees like elm, linden, and oak. When aggravated or touched, the bugs can give off a foul odor sometimes described as smelling like bitter almonds. Photo: Mormon crickets ...