Photographer Tristram Kenton: "I don’t usually take many photographs on holiday but there are exceptions. Watching the wildebeest migrate across the Serengeti, it was hard to capture the vast numbers in a photograph. Looking at this picture reminds me vividly of shortness of breath and the hairs on the back of my neck standing up when I heard the sound of hundreds of thousands of hooves thundering across the great plains towards me, and the sight of the animals eclipsing my every view!" . This week we're featuring Guardian and Observer photographers' favourite shots from over two decades of reporting around the world . . . . . . #tanzania #wildlifephotography #guardiantravelsnaps #travelgram #igtravel #instatravel #travelphotography