When the Snowy Owl's mating the caribou are tramping around the tundra where the Snowy Owl mated.
(the Snowy Owl's mating; are tramping; L:around the tundra) (the Snowy Owl; mated; L:the tundra)
the Snowy Owl's mating the Snowy Owl
are tramping mated
L:around the tundra
L:the tundra