My picks from ScienceDaily

Crows Can Recognize The Calls Of Relatives:

Most of us would know our mother's voice on the phone from the first syllable uttered. A recent Cornell study suggests that crows also can recognize the voices of their relatives. By recording and analyzing the alarm caws of American crows, Jessica Yorzinski '05 found seven subtle acoustic differences in features that differed among individuals -- differences that the crows could potentially use to recognize one another's calls. She also found that female crows had higher-pitched calls than males. Yorzinski is now a graduate student at the University of California-Davis studying the mating choices of peacocks.

The Buzzing Of Bees Can Warn Of Nearby Poisons:

Everyone has heard of the canary in the coal mine, which sways or drops dead in the presence of poisonous gas, alerting miners to get out. Now a University of Montana research team has learned to understand the collective buzzing of bees in their hives, which can provide a similar biological alert system. But bees evidently provide a lot more information than canaries. The researchers, who work for a UM spin-off technology company called Bee Alert Technology Inc., have found that the insects buzz differently when exposed to various poisonous chemicals.

Your Mom Was Wrong: Horseplay Is An Important Part Of Development:

Playground roughhousing has long been a tradition of children and adolescents, much to the chagrin of several generations of parents who worry that their child will be hurt or worse, become accustomed to violence and aggression. But animal research may paint a different portrait of rough and tumble play; one that suggests that social and emotional development may rely heavily on such peer interaction. In an article published in the April issue of Current Directions in Psychological Science, Sergio and Vivian Pellis of the University of Lethbridge reviewed multiple studies involving animals, and found a link between rough and tumble play and social competence.