Heermann's Gull heermannii

(last update: 23-01-2018 )

Coordinators:
John Cant
Mars Muusse

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1cy June
1cy July
1cy Aug
1cy Sept
1cy Oct
1cy Nov
1cy Dec

2cy Jan
2cy Feb
2cy March
2cy April
2cy May
2cy June
2cy July
2cy Aug
2cy Sept
2cy Oct
2cy Nov
2cy Dec

3cy Jan
3cy Feb
3cy March
3cy April
3cy May
3cy June
3cy July
3cy Aug
3cy Sept
3cy Oct
3cy Nov
3cy Dec

adult Jan
adult Feb
adult March
adult April
adult May
adult June
adult July
adult Aug
adult Sept
adult Oct
adult Nov
adult Dec

Heermann's Gull heermannii 1st cycle (1CY), July 17 2016, Half Moon Bay, California USA. Picture: Malia Kai De Felice.

A juvenile Heermann's Gull from Pilarcitos Creek in Half Moon Bay, taken on Jul 17 around 7:30pm.
Alvaro:
"Just a little math game here, but the world population is estimated at 500,000. If based on my count, that is the true ratio out there. A juvenile is about one in a thousand, so there are 500 juveniles out and about in the entire world range! Now if you take into context that this is one juvenile in many, many, many days of counting adults. It is closer to 1 in 5000. So only 100 juveniles out in the population. Obviously this simplistic calculation is flawed in many ways, but it gives a basic idea of how few juvs there might be out there. Assuming that most of these juvs do not make it through a year, we will have even less by May. The positive side is that given that most of the young lineages are non existent, once they begin to kick in again, it will be a great time to study age changes in Heermann's Gulls."