| April and July were the lowest nidification periods for Trypoxylon species. |
| When a raven is killed during nidification, the bereaved mate goes away, and after a short absence returns with another raven. |
| In the time of nidification the most feeble birds will assault the most rapacious. |
| In the time of nidification, the most feeble birds will assault the most rapacious. |
| Thanks about the instinct of nidification, and for your answers on many points. |
| Absolutely nothing is known of the nidification of the curlew sandpiper, and its egg has never yet been described. |
