The wildlife of Tireragan is surprisingly varied and this diversity seems to be increasing as the vegetation regenerates, though diversity and abundance is determined by the forces molding the landscape, such as climate and geology. These forces have created an ecosystem that is upland in character with many plant and animal species thriving below 100 metres here which are normally found above 1000 metres in other parts of Britain.
There are fewer species of breeding mammals on Mull than in most of the rest of Britain with mountain hares and otters the two most notable residents. Reptiles such as adders and common lizards are abundant throughout the estate and a number of amphibious species are also common.
It is likely that the insect life of Tireragan is quite unique and studies by Manchester Metropolitan University are beginning to catalog their diversity, especially in the woodlands.
One of the features of Tireragan is the mosaic of different habitats. Woodlands, bogs, mires and heather moorland form an intricate patchwork of vegetation which in turn leads to the relatively large variety of animal life.
Inside the woodlands, much of the flora is dominated by lichens and bryophytes proliferating on any solid surface such as rocks and the trees themselves. The presence of healthy populations of flowers such bluebell and cowslip in the woodlands is a sure sign of reduced grazing pressure.
It is vital to know as much as possible about the animals and plants at Tireragan to ensure that correct decisions are made for managing the land both now and in the future. With this in mind, careful monitoring of plants and animals is carried out on a regular basis.
