What are bonnet strings in guinea pigs?

Bonnet strings refer specifically to a distinctive marking found on Agouti guinea pigs. In this context, they describe the coloring pattern where the belly color continues up and under the chin, creating the appearance of a 'bonnet.' This unique characteristic is a part of the breed standard for Agouti species, which are recognized for their specific coat pattern that includes various colors and markings. Understanding bonnet strings is important for those involved in breeding and showing guinea pigs, as it highlights the nuances of breed characteristics that judges consider during competitions.

The other choices do not accurately represent what bonnet strings are, as they refer to different concepts related to guinea pigs, such as carrying techniques, types of food, or grooming tools, which do not involve the distinctive marking pattern of Agouti guinea pigs.