In Irish the porpoise is know as 'Muc Mhara' or 'Pig of the Sea' and also 'Torc na Tuinne' or 'Boar of the Waves' http://dil.ie/search?q=porpoise…

Photo: Ecomare/Salko de Wolf Den Hoorn Texel (CC BY-SA 4.0)

Another Irish name for the Seal is 'Lao Mara' or 'Calf of the Sea'.

Photo: David Hsiao (CC BY-ND 2.0)

The native Irish lizard is know as 'Earc Luachra', which roughly translates as the the 'Speckled one of the Rushes'.

Photo: Nick Ford (CC BY-NC-ND 2.0)

And finally.... The old Irish for an otter is 'Doburchù' or in English 'Water Hound' http://dil.ie/17278 

Photo: Dmitry Azovtsev • CC BY-SA 3.0