Tompot blenny
This clown-like fish is a favourite amongst divers and snorkellers. They are inquisitive little souls and will investigate divers near their hidey-hole homes.
Tope shark
This slender and elegant shark species is often found close to shore all around our coasts and can grow up to 6 feet long.
Tormentil
Tormentil can be found growing on acid grassland, heathland and moorland, but even pops up alongside roads. It bears yellow, buttercup-like flowers, but with only four petals (buttercups have five).
Traveller's-joy
The fluffy, white seed heads of Traveller's-joy give it the evocative, alternative names of 'Old Man's Beard' and 'Father Christmas'. A clematis-like climber, it can be seen scrabbling over hedgerows and in woods.
Tree bumblebee
The Tree bumblebee is a new arrival to the UK. First recorded here in 2001, it is slowly spreading north. It prefers open woodland and garden habitats and can be found nesting in bird boxes and roof spaces.
Tree pipit
This streaky brown bird is a summer visitor to Britain, favouring open woodlands in the north and west.
Tree sparrow
A scarce and declining bird, the tree sparrow can be spotted on farmland and in woodlands; it is not an urban bird in the UK. It has a brown cap and black cheek-spots, unlike the similar house sparrow.
Treecreeper
The fine, downcurved bill of the treecreeper makes this tit-sized bird unmistakeable. Look out for it in woodlands and parks, literally 'creeping' around tree trunks.
True fox-sedge
The true fox-sedge is a rare and threatened plant in the UK. It relies on lowland floodplain meadows and damp habitats, which are rapidly disappearing. Look for reddish-brown flowers in summer.
Tufted duck
This comical little duck lives up to its name – look out for the black tuft of feathers on its head!
Tufted vetch
A scrambling plant, Tufted vetch has violet flowers. It is a member of the pea family and can be seen along woodland edges, on scrubland and grassland, and at the coast.
Turkeytail
The turkeytail is a very colourful bracket fungus that grows throughout the year, but is at its best in the autumn. Its circular caps can be seen growing in tiers on trees and dead wood.