Most Butterflies and Moths have no mouth for chewing,
so cannot eat solids.
All their eating is done earlier in life when they are a caterpillar.
Some moths have developed mouthparts and eat a few
things such as pollen, but most butterflies and moths only have a
haustellum,
which is like a hollow straw,
with which they can suck fluids such as nectar, water,
tree sap, fruit juice, etc.
The provison of juice containing alcohol, such as
a mixture of beer and honey, is a good way to catch
some moths and butterflies,
as they can become too drunk to fly properly,
and are then easy to catch.
Many moths CANNOT feed at all as they have no haustellum.
They must rely totally on the
nourishment in the food eaten by the caterpillar earlier
in its life.
ADULTS CAN FEED
RHOPALOCERA (All Butterflies),
GEOMETRIDAE,
CRAMBIDAE,
PYRALIDAE,
NOCTUIDAE,
which includes the well known
Agrotis infusa : the Bogong Moth,
CALPINAE,
which includes a number that attack and damage fruit
by penetrating the skin with the haustellum to obtain the juice,
and SPHINGIDAE,
which includes a number that hover
in front of flowers like a Humming Bird when feeding,

Agrius convolvuli moth sipping nectar
through its extended haustellum while hovering
(Photo: courtesy of Linda Kay, Berrigan)
ADULTS CANNOT FEED
ANTHELIDAE,
BOMBYCIDAE,
which includes the well known
Bombyx mori : the Silkworm,
COSSIDAE,
which includes the well known
Endoxyla leucomochla : Wijuti Grub,
EUPTEROTIDAE,
HEPIALIDAE,
LASIOCAMPIDAE,
LIMACODIDAE,
LYONETIIDAE,
NOTODONTIDAE,
PSYCHIDAE,
SATURNIIDAE,
which includes the well known
Austrocaligula eucalypti : the Emperor Gum Moth,
and TINEIDAE.