Answer: swine

AnswerCrossword Clue
SWINE

Hogs and pigs

SWINE

They can't fly, but they can get the flu

SWINE

Pigs

SWINE
... before these beasts?
SWINE
Pen pals?
SWINEContemptible sort
SWINEContemptible people
SWINEDespicable sort
SWINEPigs and hogs
SWINEMud wallowers
SWINEContemptible person
SWINEContemptible individual
SWINEDirty rotten scoundrel
SWINE"Bounder!"
SWINESty dwellers
SWINESows and boars
SWINEWild boar, e.g.
SWINE"Pearls Before ..." (Stephan Pastis comic)
SWINEHogs
SWINEPen denizens
SWINEAnimals known for their boarish behavior
SWINEWild boar
SWINEOne is hidden in each theme entry
SWINE"Pearls Before ..": Stephan Pastis comic
SWINEPigs, collectively
SWINEDespicable ones
SWINEContemptible ones
SWINEFarm animals
SWINEPorkers
SWINEMud bathers
SWINEPorker.
SWINECirce's victims: Homer's "Odyssey."
SWINEDoltish person.
SWINETamworth, Large Yorkshire, etc.
SWINEFarm animals.
SWINEGrunters.
SWINEHog.
SWINEUlysses' men under Circe's spell.
SWINEHogs.
SWINEPoland Chinas.