1. “We’ve found from our studies that males actually don’t vocalize as much—much, much less than females. So a lot of what we’re recording actually are females talking to their babies and talking to each other. And males are sort of hanging out there and being quiet.”
What's the meaning of "hanging out"?
2. In 2013 researchers attached sensors to two Antarctic minke whales. The tags could track depth and location—and also record vocalizations. Over a combined total of 26 hours, 32 calls were captured—including some low-pitched pulses. Some of which matched recordings made nearby of the bio-duck sound. The minke whale is thus revealed to be the source of the decades-old unidentified bio-duckitude.
What is "duckitude"? I can't find it in the dictionary
3. Researchers have discovered that teenager drivers who have a high sensitivity to stress actually have lower rates of car accidents than their mellow friends.
What is "mellow friend"?