
Ireland's 5, 10 and 50 pence coins.

Ireland's ½ penny, 1 penny and 2 pence coins.
Ireland was yet another unusual case. The Irish transferred Metcalfe's bull and fish from the shilling and florin to the 5 pence and 10 pence respectively, because they were equivalent in value (1 shilling = 5 pence; 1 florin = 10 pence). Originally, the Irish had wanted to retain most of the old Metcalfe designs, but they decided that they could only do this if the values of the old and new coins (e.g. shilling and five pence) matched. The decimal ½ penny, penny and 2 pence did not match any predecimal coin, therefore the Irish thought mass confusion would ensue, and they chose some new, non-Metcalfe designs instead. This made for a very awkward set, design-wise, in which three of the designs were in an entirely different style from the other three and were also thematically entirely different.
The Irish, meanwhile, had no qualms about moving the woodcock from the lowly farthing to the heptagonal 50 pence (the highest decimal denomination), because the two were very different in size and metal (and also shape), but more importantly the farthing had been defunct for about a decade by the time the 50p was issued.
So, Ireland was yet another case where a design, in this case the woodcock from the farthing, ended up on a decimal coin whose value was not the equivalent of the predecimal coin from which it originated. Like Britannia, the woodcock had migrated from a low value coin to the highest denomination.
See also:
1]
Ireland's hybrid decimal design series.
2]
The coinage of the Irish Free State.