Tortoises are having it away and Jack gives them room to manoeuvre

[esteven]

On a walk of this kind in the Mediterranean islands he usually saw tortoises, which he did not dislike at all - far from it - but they seemed rare on Gozo, and it was not until he had been going for some time that he heard a curious tock-tock-tock and he saw a small one running, positively running across the road, perched high on its legs; it was being pursued by a larger tortoise, who, catching it up, butted it three times in quick succession: it was the clap of the shells that produced the tock-tock-tock. 'Tyranny,' said Jack, meaning to intervene: but either the last blows had subdued the smaller tortoise - a female ? or she felt that she had shown all the reluctance that was called for; in any case she stopped. The male covered her, and maintaining himself precariously on her domed back with his ancient folded leathery legs
he raised his face to the sun, stretched up his neck, opened his mouth wide and uttered the strangest dying cry.
'Bless me,' said Jack, 'I had no notion . . . how I wish Stephen were here.' Unwilling to disturb them, he fetched a cast quite round the pair and walked on, trying to recall some lines of Shakespeare that had to do not exactly with tortoises but with wrens...

(chapter 2)

This charming scene has it all: tortoises, Jack yearning for Stephen and sex. ;D

Testudo Aubreii for all eternity

[esteven]

' We have laid down the island as exactly my God, what is that monstrous thing?'
'It is a tortoise, my dear. The great land-tortoise of the world: a new genus. He is unknown to science, and in comparison of him, your giants of Rodriguez and Aldabra are inconsiderable reptiles. He must weight a ton. I do not know that I have ever been so happy. I am in such spirits, Jack! How you will ever get him aboard,I cannot tell; but nothing is impossible to the Navy.'
'Must we get him aboard?'
'Oh, no question about it. He is to immortalise your name. This is Testudo aubreii for all eternity; when the I hero of the Nile is forgotten, Captain Aubrey will live on in his tortoise.
There's glory for you.'
'Why, I am much obliged, Stephen, I am sure. I suppose we might parbuckle him down the beach.

(chapter 11)

Testudo aubreii just has to put in an appearance at where_away