A plump or overweight bird; sometimes used informally or pejoratively to refer to certain bird species that appear heavy or rotund.
Compound word from 'fat' plus 'bird.' This is an informal, colloquial term that combines literal description with common English word-formation patterns.
Many birds that look 'fat' are actually just fluffed up—they puff their feathers for insulation or intimidation, so a bird can look 50% larger than its actual body. 'Fatbird' is literally an optical illusion created by evolution for survival purposes.
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