Being top of the food chain we have allowed our senses to diminish. Blind people have heightened their other senses. Natives in the jungle can still be predated and therefore retain their heightened senses, so I would still argue we have allowed our senses to diminish. Being top of the food chain allows us the luxury of allowing our senses to diminish, but, never having served, I would imagine members of the forces have to re-develop their senses dependent on the situations they are placed. In this manner our senses are still there to be used, therefore evolution has no say in the lessening of them. All of this is just a moot point however, since the original post was making a comparison between the senses of a pigeon and the senses of humankind. My post stated that all their senses would be heightened in comparison to ours. You took up on the word allowed instead of considering the person's question and answering that. What if every post was scrutinised for correct usage of the English language and grammar? No question would ever be answered because we would be continually arguing over trivialities and God help those on here who use the Doric or Scots, let alone slang.