| They are gregarious throughout the year, with the exception of the laying and incubation period. |
| The hatching success in the Manx shearwaters is strongly determined by the incidence of rainfall during the incubation period. |
| It has an incubation period of between two and 10 days and initial symptoms are similar to flu. |
| The local experience indicated that the incubation period is between two and 11 days. |
| It was extremely difficult to estimate how many people have a disease which, frighteningly, may have an incubation period of as long as 40 years. |
| There is no support for the idea that female larks work harder during the chick rearing period compared with the incubation period. |
