Synopsis
In the pine forests of Scotland, fights between male capercaillies are very violent. Capercaillies are the largest of the grouses. The most powerful male claims the best display area and will drive off any intruder - including David Attenborough. The capercaillie charges at David, chases him about and knocks him over. Males display at each other and it develops into a fight during which the birds might be badly injured. The females look over the males and pick a mate - one male is the champion and almost attracts more mates than he can deal with.
Rhea war dance | Natural World
Male rheas fight to win a harem of females.
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A parrot finds a tree hollow to lay her eggs in, the hollow is dry and out of reach from predators. The cockatoos also want to use the hollow for nesting and fight the parrot.