September on Ramsey Island is right in the middle of grey seal pupping season. I have to say that, despite views to the contrary, my real wildlife interests are in mammals rather than birds, so a couple of weeks on the Island at this time of year gives me an opportunity to take a look at some of the UK’s biggest.
Ramsey is the largest pupping location in south-west Britain and around 500 to 700 born on its beaches each year between August and November. Walking around the island, the calls of the adults and pups can be heard coming up from the shoreline in most places and I could even hear them whilst I was lying in bed this morning.
My time on Ramsey this year hasn’t just been spent looking at them for fun, I have also been helping with the ongoing monitoring work that the RSPB do. I have been helping out with two sets of work. The first involves taking photographs of the adults; the images are then uploaded onto a database which has pattern recognition software and can identify individual seals. This enables the seals to be tracked between different locations on Ramsey and much further afield.
The second monitoring task has been surveying the pupping beaches every three days. The surveys involve counting all pups, all females on the beaches, females in the water, all males and any dead pups (old or recent). The pups are also categorised according to a set of aged-related parameters:
- Class I – new born – very loose baggy skin, wet/red umbilicus – 14kg
- Class II – 6 to 10 days old – starting to fill out but still an obvious neck, no loose skin folds on the body
- Class III – 11 to 15 days old – Outline rounded to barrel shaped, no wrinkles, no neck
- Class IV – 16 to 20 days old – Patches of white natal fur moulted to reveal first-year pelage underneath
- Class V – 21 days + – Fully moulted, independent and weaned – 45kg
It’s quite amazing just how fast the pups grow and that in just three weeks they are weaned and independent. Growing at an average rate of 1.5kg a day on the rich milk of their mothers, they soon turn from yellowy-white wrinkly bags of wet fur, through to miniatures of their parents.
Aber Mawr, just south of the Bungalow where the volunteers stay, is the largest bay on the Island and also the largest pupping beach. The first count I did there revealed 91 pups but a few days later, following a storm, there had been a drop of nine. Compared to some of the storms last year, however, the pups got off quite lightly. Storm Orphelia, in October 2017, washed away many pups with the count across the Island dropping from 120 to 31. We’ll have to wait and see what further storms come their way this year.
More to come on the seals…