Dust and smoke and steam swirled around and out of the braking vents as the spacecraft landed. It’s silvery silhouette still glowing from atmospheric entry. The tapering ship sunk into the ground until its huge diagonal fins gripped and held its bulk firmly. Woodland covered much of this continent but here at least it gave way to a grassy plain, an irresistible landing area for space faring visitors.
There was a male and female aboard, one roused from hibernation only hours before arrival and another who had converted their ship from a galactic inhabitant to an atmospheric craft as well as make the logistic decisions as they entered this solar system about where and when to land. They were both tense; excited and enthused by the prospect of exploring a new world. 
Meanwhile, the planets own inhabitants sat on tree branches, about which their tails were firmly coiled, the leaves shielding their eyes from the sunlight while they waited for movements from the ship. This was nothing new for many of them. The younger ones clicked in excitement but the older wiser ones patiently waited for developments. The lower door pivoted out and down, creating a steep gangway. The first of the ships occupants walked down to the ground. He or she looked around, twisting in a silvery carapace to the left then the right. Another followed the first, and likewise studied the surrounds completely unaware of the many primate eyes watching them.
Machines pistons began repeatedly driving the lower limbs of the carapaces, the two spacers headed deliberately away from the ship, cracking the branches as they moved through the forest. They had a definite direction in mind, they always did. The indigenous followed along, skittering along the trees and abundant branches, they moved without any fear of falling, confidently and always out of sensor range of their quarry. 

The spacers entered the clearing, and there two hundred meters away, was the edge of the great dish, it has survived, cared for by the local inhabitants for hundreds of years. They saw them kneel by it, and then carefully tread around its perimeter, after a kilometre they found the narrow access tunnel and tore off the metal grate with a gust of steam from the arm vents. The carapaces were too large to negotiate the tunnel, there was a hiss of escaping vapour, and two humanoids dropped to the surface. They entered the tunnel, almost inpatient in haste.

The primates waited, the rains which had been threatening from far off finally loosened and water bucketed out of the sky. Their fur soaked, the young ones had built up courage enough to touch the abandoned metal bodies. In time they lost interest and rejoined their elders on the edge of the clearing. 

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They revisited the ship that had landed so dramatically a few weeks before. Already the vegetation was moving toward the silvery ship, in a few months it would be invisible like all the others, toppled then smothered in the trees and foliage. All the previous visitors who had voyaged countless miles and for hundreds if not thousands of years still lay beneath the dish, a maelstrom of lost souls, all who had pursued the television signal from the dish which began transmission two thousand years before, and was the bait, the fly trap that protected the inner, greater and hidden worlds a parsec away. The engineered primates sat eating leaves and fruit, and watched their planet remove one more invader. Their job done.