The sentence "Moreover, it is probably just as valuable or more valuable to us now, than it was in the ancient past".
Answer:
I think the answer is rat
“As Atticus tells Jem and Scout, a mockingbird does no harm and makes music for people to enjoy. Tom Robinson is like a symbolic mockingbird because of his innocence; he has not harmed anyone and is an admirable character who offers help to others. Because Tom is not guilty, it makes it "sinful" to harm him.”
That event was historically correct.