Sean Beckett May 11, 2014 The Yellowstone Phenology Project: 5-11 Ibis Sean Beckett May 11, 2014 White-faced Ibis and other rare birds are occasionally seen this time of year during brief stopovers on long, trans-continental migrations. Digiscope photo HAPPY MOTHER'S DAY! First bison calves of the year in grand teton national park!