Random triples
| Subject | Object |
|---|---|
| gptkb:Thryothorus_ludovicianus_longicaudus | varies by region |
| gptkb:Toxostoma_rufum | regional differences observed |
| gptkb:Coccothraustes_carolinensis | regional differences |
| gptkb:Lyrebird | Songs vary by region |
| gptkb:Tūī | highly variable songs |
| gptkb:Copsychus_saularis_andamanensis | regional differences |
| gptkb:Menura_superbia | highly variable among individuals |