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Bessie Liddle reaches for what she calls 'bush coconuts", which are the knobby galls on the branches of the bloodwood tree. These are formed when a light green grub Cystococcus echiniformis burrows under the bark of the tree and secretes an irritating saliva which causes the tree to form a protective gall around the insect in a sort of oyster-and-pearl scenario, north of Alice Springs, Central Australia. (Man Eating Bugs page 25)