If you're asking about fishes, the offspring may be uncountable.
Reindeer usually have one calf at a time.
one at a time usually
usually one at a time.
rabbits can have as many babies as posibble but it is unfair to make them have too many !
Usually one or rarely two.
Ground squirrels have one litter per year that usually have nine babies.
The penguin species usually have only one offspring per couple.
They usually have up to 3-6.
Usually one.
They usually have up to 3-6.
Usually only one.
two is how many they usually have, but they sometimes have three.