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Researchers have been able to see and to measure the change in the timing of spring here. the 75 years that we have been studying the tits here, we have seen quite a marked shift in the timing of egg laying. so now they are laying about three weeks earlier. than they were in the 1940s. the tits here are actually managing to track the other members of their food chain quite well. so both the caterpillars and the oaks have also shifted their timing earlier, so the whole sort of food chain has shifted earlier in the spring. the woods were bequeathed to oxford university by a wealthy local family back in 1942. since then, they have been the site of dozens of different scientific projects. but the longest running is the great tit study, which chris perrins has been involved in for more than half a century. and what are your reflections on the seasonal shift? that is fine. unless it gets to limits where the trees, or the caterpillars, or the birds can t do that shift because it s too big. an ....