1.   Emory researchers noted the genetically altered mice developed vasopressin receptors in the same parts of the brain as in prairie voles.

2.   Prairie voles, you see, are famous for being faithful.

3.   The airline settled another lawsuit last summer over six prairie voles, similar to rats, that died in the cargo area from heat exposure.

4.   The rodents are prairie voles, a species known for being sociable and monogamous.

5.   This emotional glue is also key in keeping the famously monogamous pairs of prairie voles together for life.