Join Date: Oct 2009
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I believe they know. But the bird's response to an ill or challenged bird is unpredictable. One budgie I have now nearly killed a disabled budgie hen.
On the other hand, my linnies have paired with geriatric/disabled buddies of their choosing, often same sex, and care for them tenderly. If not a buddy, a linnie may keep a weak bird from food and water, so it depends upon whether they like the other individual or not.
Cross species -- well, I won't even go there!