Birds of a feather flock together is an English proverb. The meaning is that beings (typically humans) of similar type, interest, personality, character, or other distinctive attribute tend to mutually associate.
The idiom is sometimes spoken or written as an anapodoton, where only the first part ("Birds of a feather") is given and the second part ("...flock together") is implied, as, for example "The whole lot of them are thick as thieves; well, birds of a feather, you know".
The first known written instance of metaphorical use of the flocking behavior of birds is found in the second century BC, where Ben Sira uses it in his apocryphal Biblical Book of Ecclesiasticus, written about 180–175 BC.
More recent rendering gives "Birds roost with their own kind, so honesty comes home to those who practice it" (New Revised Standard Version Catholic Edition, 1989).
- https://en.wikipedia.org/wiki/Birds_of_a_feather_flock_together# (with editing)
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I always feel amazed when observing animals' behaviours, especially their interactions with each other, between the same kind or different. The most interesting and touching part is to see friendship between different species, eg. when a dog touching the nose of a cat, when a crow guarding a human baby (see:
So to me, what "birds of a feather " ( 物以类聚人以群分，志同道合or狼狈为奸) ain't about physical attributes, but what insides of each of us (or 三观) to separate or bond us.
I learned this in both real and virtual world, especially during my two year experinces in WXC (blog and 11 forums), where beauty and ugliness co-existed, and humanity shone through the covers of IDs. 
So this must be the reason why I feel MYSJ/APAD is "home" now, because we are "birds of a feather", so are bonded and standing together through thick and thin. 
Have a beautiful Thursday my friends!!!
