Table 1. Diagnostic features of developmental modes in bird hatchlings.
| Developmental modea | Plumage | Eyes | Nest attendance | Parental care |
| P1 | Contour feather | Open | Leave | None |
| P2 | Down | Open | Leave | Brooding |
| P3 | Down | Open | Leave | Food showing |
| P4 | Down | Open | Leave | Parental feeding |
| SemiP | Down | Open | Nest area | Parental feeding |
| SemiA1 | Down | Open | Stay | Parental feeding |
| SemiA2 | Down | Closed | Stay | Parental feeding |
| A | None | Closed | Stay | Parental feeding |
aP1: precocial 1; P2: precocial 2; P3: precocial 3; P4: precocial 4; SemiP: semiprecocial; SemiA1: semialtricial 1; SemiA2: semialtricial 2; A: altricial.