Este é o conto clássico de Stanley G. Weinbaum de 1934, Uma Odisséia Marciana, que você pode ler (legalmente!) gratuitamente aqui ou comprar em O melhor de Stanley G. Weinbaum.
Aqui está o alien:
‘The Martian wasn’t a bird, really. It wasn’t even bird-like, except just at first glance. It had a beak all right, and a few feathery appendages, but the beak wasn’t really a beak. It was somewhat flexible; I could see the tip bend slowly from side to side; it was almost like a cross between a beak and a trunk. It had four-toed feet, and four-fingered things - hands, you’d have to call them, and a little roundish body, and a long neck ending in a tiny head - and that beak. It stood an inch or so taller than I, and - well, Putz saw it!’
E a criatura-pirâmide:
‘There was a line of little pyramids - tiny ones, not more than six inches high, stretching across Xanthus as far as I could see! Little buildings made of pygmy bricks, they were, hollow inside and truncated, or at least broken at the top and empty. I pointed at them and said ‘What?’ to Tweel, but he gave some negative twitters to indicate, I suppose, that he didn’t know. So off we went, following the row of pyramids because they ran north, and I was going north.
‘Man, we trailed that line for hours! After a while, I noticed another queer thing: they were getting larger. Same number of bricks in each one, but the bricks were larger.
‘By noon they were shoulder high. I looked into a couple - all just the same, broken at the top and empty. I examined a brick or two as well; they were silica, and old as creation itself!’
O restante da sua descrição também é adequado.