Galls

Tiny wasps lay their eggs in plants and the larvae develop in swellings called galls. Plant selection and the size and shape of the galls is a characteristic of each wasp species. These galls were on a small oak tree and were about 3 to 4 inches in diameter. Incidentally, larvae don't have the anatomy to excrete fecal matter until after they pupate. Photo: Catherine Creek near Lyle, Wa. © 2007 mkellar

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