Bison rut in Yellowstone | Wild West – America’s Great Frontier
During the rut, bison bulls in Yellowstone battle one another for access to receptive females. Bulls sometimes die from the injuries they sustain during these violent clashes.
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![](https://era.org.uk/app/uploads/2022/12/Natural-World-2015-2016-Attenboroughs-Big-Birds-Rhea-war-dance-400x230.jpg)
Rhea war dance | Natural World
Male rheas fight to win a harem of females.
![](https://era.org.uk/app/uploads/2022/12/Australia-Earths-Magical-Kingdom-Series-1-Land-Cockatoos-400x230.jpg)
Cockatoos | Australia: Earth's Magical Kingdom
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.