“We planted our crops in the spring, and they came up, and were looking nicely, and we were cheered with the hopes of having a very abundant harvest. But alas! it very soon appeared as if our crops were going to be swallowed up by a vast horde of crickets, that came down from these mountains-crickets very different to what I used to be acquainted with in the State of New York. They were crickets nearly as large as a man's thumb. They came in immense droves, so that men and women with brush could make no headway against them; but we cried unto the Lord in our afflictions, and the Lord heard us, and sent thousands and tens of thousands of a small white bird. I have not seen any of them lately. Many called them gulls, although they were different from the seagulls that live on the Atlantic coast. And what did they do for us? They went to work, and by thousands and tens of thousands, began to devour them up, and still we thought that even they could not prevail against so large and mighty an army. But we noticed, that when they had apparently filled themselves with these crickets, they would go and vomit them up, and again go to work and fill themselves, and so they continued to do, until the land was cleared of crickets, and our crops were saved. There are those who will say that this was one of the natural courses of events, that there was no miracle in it. Let that be as it may, we esteemed it as a blessing from the hand of God; miracle or no miracle, we believe that God had a hand in it, and it does not matter particularly whether strangers believe or not.”

Journal of Discourses 21:276-277 (June 20,1880)
Pratt describes the event in which seagulls disposed of swarms of crickets that were destroying their crops.
Miracle of the seagulls and crickets