Illustration of a representative sequence of movements comprising tail chasing in a naïve pregnant dam. Photographs in A represent departure from the core nest area. Photographs in B represent engagement with the tail. Photographs in C represent a return to the core nest area. A1) Dam proceeds from core nest, A2) to the open space of her home cage. B1) Dam takes interest in her tail, B2) and rotates in the attempt to catch her tail with the mouth, B3) continuing the rotation while holding the tail in her mouth. C1) Dam with tail in mouth begins return to core nest, C2) and delivers the tail to the core nest. The central map shows a representative trajectory of a horizontal movement sequence in the home cage. Numbers 1 and 2 indicate start and end points of the movement, respectively.
Ward et al. BMC Pregnancy and Childbirth 2013 13(Suppl 1):S9 doi:10.1186/1471-2393-13-S1-S9