Birds of Ireland: Blackcap

A blackcap, which is about the size of a robin, can be very aggressive at a bird table

A blackcap's call is a harsh tcek repeated many times if it's alarmed

Blackcap | Caipín dubh | Sylvia atricapilla

A blackcap is about 13-14 centimetres long with a wingspan of 22 centimetres. They are a common breeding species found on woodland and in gardens here all year round. 

A blackcap is about the size of a robin. They can be very aggressive at a bird table. Males have a neat jet-black cap and a cold brown-grey body with a pale throat, vent, and undertail coverts. 

Females, juvenile and immature blackcaps have a less noticeable, pale chestnut-brown cap which is usually brighter on young birds which are slightly browner overall.

There are no noticeable markings on the body or wings when a blackcap is in flight.

A blackcap's call is a harsh tcek repeated many times if it's alarmed. The song is a series of very varied warbling notes, becoming louder towards the end. 

Tip of the week

Make your garden bird-friendly by planting suitable trees and plants such as berry bushes and by providing water, perhaps by making a permanent pond. 

The plastic rings holding packs of beer or soft drink cans together can get caught around birds' necks and result in their suffering a long, slog, agonising death. Always cut up these plastic rings before throwing them in the recycling/bin. And if you come across them outdoors bring them home or tear them up on the spot. 

Featured in Birds of Ireland: A field guide by Jim Wilson, with photographs by Mark Carmody

• Jim Wilson is a wildlife writer, broadcaster, tour leader, and former chairman of BirdWatch Ireland. He has been involved in the study and conservation of birds in Ireland for more than 45 years, contributing to several major surveys and international projects.
• Mark Carmody is an award-winning wildlife photographer, has a PhD in biochemistry and works as a European patent attorney.