Some had been specially bred over decades for scientific purposes.

Rabbits were bred specially and do not seem to have been common until relatively recently.

The animals were specially bred, confined and forced to fight.

Specially bred rats have been kept as pets at least since the late 19th century.

These rats had been specially bred to express those genes.

And those cows specially bred to produce double the milk: they only live half as long.

Roosters are specially bred to fight, first entering the ring between one and two years of age.

All of these types of carrot have been specially bred.

They had been specially bred in the early days of the empire I had abandoned.

Could the tripeds we've encountered have been specially bred to function in our environment?