Deadly yew — used in witch's potions and to deter cattle from graveyards

Yew trees were once widespread throughout Ireland. Irish names for Yew include Iúr and Eó. Mayo is anglicised from ‘Maigh Eó’ which translates as ‘The Plain of the Yew’; Terenure comes from ‘Tír an Iúr’, ‘Land of the Yew’; and Youghal comes from Eochaill, a yew wood

The seeds of yew berries are poisonous.  Fortunately for the enthusiastic song thrushes, blackbirds, waxwings and robins that feast on yew berries, neither their beaks not their stomach muscles are strong enough to crack open of break down the seed, allowing it to pass through the bird undamaged, with no ill effects

Yew berries are ripe right now.

The berries are the only part of the yew tree that is not poisonous — but the large seeds that are concealed inside the berries are poisonous so its best not to take any risks by eating the berries.