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差別?、改良型餌台 Discrimination?, an improved bird feeder

野鳥用の餌台ですが目の粗いネットで囲み、雨よけ天井板を被せました。
メジロと同じくらいの大きさの野鳥はネット内に自由に出入りして餌を自由に食べることができますが、カラスやヒヨドリのような大きな鳥には無理です。
これで小さなメジロたちは餌を確保できますが、これはえこひいき、差別になるのかな?
The bird feeder has now been enclosed by an open weave net and covered over with a round plastic ceiling as a rain hood.
The little birds whose sizes are as large as Japanese white-eyes can freely enter to eat food and leave, but not big ones such as crows or bulbuls.
This secures the enough food for the little sized birds, but is this discrimination?