- progne subis
- porphyrin disease
- porphyrio porphyrio
- psittacula krameri
- pipilo erythrophthalmus
- psittacus erithacus
- pavlovian
- pavo cristatus
- picometer
- principles
- phalaenoptilus nuttallii
- pico second
- picus viridis
- ptloris paradisea
- phyllorhynchus
- phylloscopus sibilatrix
- passerina cyanea
- passeriformes
- ptilonorhynchus violaceus
- pile on the agony
- pedioecetes phasianellus
- porphyrula martinica
- phalaropus fulicarius
- philohela minor
- philogynist
- puffinus puffinus
- phasianus colchicus
- psocopterous insect
- psophia crepitans
- polyblasts
- plectrophenax nivalis
- polyborus cheriway audubonii
- pica em
- porzana porzana
- proconsul africanus
- pooecetes gramineus
- poenology
- plauson mill
- pernis apivorus
- prunella modularis
- pezizales
- podaxaceae
- procellaria aequinoctialis
- parus atricapillus
- phalacrocorax carbo
- parula americana
- phaeophyta
- psammoma
- poliomyelitis
- pluvianus aegyptius