Coordinators:
John Cant
Mars Muusse
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adult Jan
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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."
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Heermann's Gull heermannii