ocr: All four walls were opaque and just the roof was open SO that there was no disturbance for the birds. But what we found was that we'doverdone it. The offspring that were born in those environments were basket cases because they hadn'tgot the sensory input they needed. We'dgoti it completely the wrong way round. I I mean, animals may not be intelligent, but they're not - as stupid as a lot of human beings.
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