The behavior you're describing, where two moose are exhibiting head-down behavior with their antlers touching, is likely a form of social interaction that could involve sparring or a display of dominance. This type of behavior is often seen during the mating season (rut) and serves several purposes that are beneficial for reproduction and passing on genes.
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Dominance Display: Male moose often engage in ritualized sparring to establish dominance hierarchies. The dominant male may gain access to more resources, including food and mating opportunities with females. By displaying strength and resilience in these encounters, a male can signal his fitness to potential mates.
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Mate Selection: Female moose may choose mates based on their physical prowess and fighting ability, which are indicators of genetic fitness. Males that can successfully spar and maintain dominance are often the ones that pass on their genes, as they are more likely to be chosen by females.
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Allopreening and Social Bonds: While not specific to mating fitness, such interactions can also play a role in strengthening social bonds among moose. These bonds can be crucial during the breeding season, as they help in forming groups that can protect females and young moose from predators.
Overall, this type of behavior aids in reproduction and gene passing by allowing moose to establish dominance, attract mates, and showcase their fitness to potential partners.