What are (wing area)/(weight) ratio in birds and airplanes? I like to know the usual ratio of wing area over weight in birds and airplanes? 

I mean if total weight of an airplane is 100 Lbs(Kg), how much should be the least total area of it's wings?

And also like to know this ratio in birds, if there are information about?

I need this ratio to estimate the wings size, if I want to create an aircraft to lift different weights(it's weight + load weight).

For example, if a person with 150 Lbs wants to fly, how much should be the least area of his wings?
From 'The Simple Science of Flight', by Henk Tennekes, MIT Press

https://mitpress-request.mit.edu/sites/default/files/titles/content/9780262513135_sch_0001.pdf