Breeding pair insect. True breeding pairs are rare in amphibians or reptiles, although the Australian Shingleback is one exception with long-term pair-bonds. Some fish form short term pairs and the French angelfish is thought to pair-bond over a long term. True breeding pairs are quite common in birds. Breeding pair arrangements are rare in mammals, where the prevailing patterns are either that the male and female only meet for copulation (e.g. brown bear) or that dominant males have a harem of females (e.g. walrus). Breeding pair Breeding pair is a pair of animals which cooperate over time to produce offspring with some
What Is and What Should Never Be (Supernatural) deceased girlfriend—but she was busy filming for the Texas-based television series "Friday Night Lights". Because Jessica was an integral aspect of the storyline, the production schedule was adjusted to accommodate the actress. The first five days of filming commenced for "What Is and What Should Never Be", and production then shifted to "All Hell Breaks Loose, Part One" until Palicki became available for the final three days of filming. However, she was not present for filming of the episode's climax. Instead, the actress filmed her part in front of a blue screen, and was later digitally added into the scene.