The bigger your brain, the longer you yawn | Science | AAAS
Body language signals for rodent social communication in rodents
Why are yawns contagious? We asked a scientist | PBS News
Yawn - Wikipedia
Yawning: a cue and a signal - PMC - PubMed Central (PMC)
Brain size and neuron numbers drive differences in yawn ... - Nature
The causes and consequences of yawning in animal groups
baby mouse yawn - YouTube
There's an Odd Correlation Between Brain Size And Yawning, …
Yawn duration predicts brain weight and cortical neuron number …