How long do cormorant dives usually last?

For most cormorant species, dives typically last less than half a minute, though it is not uncommon for them to remain underwater for up to one minute.1

The duration of these dives is often directly related to the water depth when the birds are feeding on the bottom. Following a dive, cormorants require a rest period that generally averages between one-half and one-third of the time spent underwater; however, if a dive is particularly long, the subsequent rest period may approach the length of the dive itself.1