Rabbits and Rats, Birds and Seeds, Cactus and Trees: Plants and animals at work

"I am more than 80 years old," begins Renaldo, "and I've lived here all my life. - What killed the cactuses whose woody "skeletons" we see stretched out on the ground?. - Why are grasses and small flowering plants dotted over the landscape in patches, almost as if they were planted in small gardens?.

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