A fly's taste organs are its feet. If it lands on sugar, it will stamp on it to determine that it can be eaten before it begins its meal.
Flukey frogs
Flukey frogs There is new evidence that the cause of widespread
deformities in North America's frog populations is due to parasites
rather than pollution. A research team from Stanford University in
California has found that Pacific tree frogs which had been exposed
to the parasitic flukes of a family of aquatic snails developed
limb deformities. 8 MAY 1999, P. 15