An airline passenger discovered the a frog perched on a slice of
cucumber while on a Qantas flight from Melbourne to Wellington in
February. “Naturally there was a bit of consternation by the
passenger who called back the attendant,” Ministry of Agriculture
and Forestry quarantine general manager Fergus Small said. 
The flight attendant removed the salad and the 4 cm (1.6 inch)
whistling tree frog, which was killed by quarantine staff when the
aircraft landed.  Qantas was not immediately available for
comment but a spokesman told The New Zealand Herald newspaper the
airline had since changed its lettuce supplier and introduced
“additional procedures into the salad supply process.”