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This page lists sightings of various wildlife and flora seen in our patch of the river. It would be useful to build up a month by month record sightings so please submit your sightings.

To see images and videos of many of the species listed below, please see the

RSC Blog and

Photos and Videos section.


2015-2017. We have been conducting a bird survey along the river with members visiting their adopted patch at least once a month to see what is around. See the results here: Bird Survey

During the initial river survey in April 2012, between the Dolerw Park Bridge and the Cambrian Bridge, the following birds were identified: Mallards, Wren, Willow Warbler, Blue Tit, Robin, Blackbird, Siskin, Pied Wagtail, Black Cap, Herring Gull, and Magpie.

Mochdre Brook during late Spring, 2012 -  Pied Wagtail, Nuthatch, Long Tailed Tits, Blue Tits, Great Tits, Siskin, Chiffchaff, Female Goosanders.

Trehafren during late Spring 2012  -  Male Goosanders.
Trehafren during early Summer 2012- Goosander with approx 10 chicks.

September 2012, kingfishers have been seen in the area around the Halfpenny Bridge. Seen in the Mochdre Brook area  -  Kingfisher, Grey Wagtail, Dippers, Grey Heron (adult). Seen by the Elephant and Castle  -  Grey Heron (Juvenile), Dippers.

End of October 2012, seen by Russ Edwards, Grey Wagtail and Goldfinch feeding by St. Mary’s Church. Grey Heron feeding by Dolerw Bridge. Kingfishers at Trehafren, Vaynor and Mochdre Brook (1 at each site). Dippers, Long Tailed Tits and Goosanders (2 female)  at the Mochdre Brook

March 2013, two Great Crested Grebes near the Dolerw footbridge, reported by Brian Poole.

Mammals and water invertebrates

Mink, otters and American Signal Crayfish have been seen in various parts of the river over recent months in 2015.


In April 2012, between the Dolerw Park Bridge and the Cambrian Bridge, bumble bees, Comma and Orange Tip butterflies were seen.

Lots of Mayfly were seen by the Mochdre Brook in late May and Blue Damoiselles at the end of Trehafren around the same time of the year.

A Gatekeeper Butterfly was seen on the riverbank by Trehafren on the 09/09/12 at about 9.00am.