For example, the density of wood in a palm tree trunk varies, depending on the load it must support.
The tear-shaped frame of the Treetent is constructed from steel, covered in canvas and anchored to a tree trunk.
Rachel McDonald, the pub's owner, said there was "lots of mud everywhere" and said the river had been blocked by a fallen tree trunk.
As I was walking into work this morning, I saw an evergreen that's probably got a tree trunk two or three feet in diameter that was completely on its side.
The pair were on a fishing holiday and had been out on the loch in a boat when they saw what they thought was a tree trunk heading towards them at speed.
Andrew Rettie, secretary of the Scottish Games Association, the body which decides the length of the tree trunk used in tossing the caber, says that the average Highland games attracts a mere 3, 000-4, 000 people.
It's a timber cabin grown grand, three stories' worth, with a big front porch supported by tree-trunk columns.
Her torso, outlined in light, was like the trunk of a cypress tree just entering the soil.
There's been success in creating figure in the same tree by binding bamboo sticks tightly around the trunk with elastic cord to create "dents" in the growth rings.
But a tree cannot be healthy if the branches are overburdened, the trunk is damaged, or the roots are weak.
For trees especially, he said to mulch the ground surrounding the trunk as far out as the end of the tree's branches.
If they were branches of a tree weighed down with snow, they would be torn from the trunk in the first breeze.
Sunday's fire broke out amid a group of apartment blocks on the 2km-long Trunk of the island, which is shaped like a date palm tree.
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