Like a lion Gryffindors are:

strong

always 'hunting' together

respectful of others

never obeying rules

moody and changeable

will let you know when they're not satisfied

Like an eagle Ravenclaws are:

unique

extremely intelligent

anxious trusting others, and always test before they trust

always see things from a different perspective

fearless

leaders without being bossy

Like a badger Hufflepuffs are:

often underestimated

stronger than they appear

protective of those they love

independent

willing to do anything to achieve their goals

members of complex social groups

Like a snake Slytherins are:

flexible

constantly misjudged

owners of a sharp, venomous mouth

sleek and cool

solitary

able to devour enemies larger than themselves, if they so choose