31.   The thick-bills rely on pinon pines not just for food but for nesting sites, using woodpecker holes or natural cavities in mature trees.

32.   The trail is covered by a canopy of mature trees.

33.   These were low-intensity fires, which mature trees could easily survive.

34.   This mass of insects has consumed nearly every mature spruce tree on the Kenai, until there is very little left to eat.

35.   Those fires are closely monitored and intended to remove excess brush and dead needles, reducing the possibility of wildfires this summer that could consume mature trees.

36.   To do this, Nye dons a utility belt and a backpack full of supplies during the heat of summer and scales mature trees to get to the nests.

37.   To find out more, Schlesinger and his colleagues have monitored growth of mature trees in Duke Forest, N.C.

38.   To make the connection between his plantings and the mature trees, it was important for Curry to learn about structure.

39.   To showcase their outdoor furniture, fountains and pots, they installed a flagstone courtyard with mature olive trees and locally made iron gates.

40.   What is known is that young trees, and young branches that sprout from old stumps, seem to hold on to their leaves longer than mature trees do.