a pigeon

to endanger - endangered

extinct

to destroy an army

a species -species

to be endangered

clean

to destroy hopes

an insect

to damage - damaged

dirty

to be damaged by 

a mammal

to include -included

slow

to include on the list

a habitat

to cure - cured

healthy

to be included

cardboard

to destroy - destroyed

dangerous

to cure a patient

a creature

to be destroyed

noisy

to cure an illness

a reptile

boring

to be difficult to cure

a savanna

quiet

a lovely /poor/ kind creature

interesting

busy

expensive