What is a masculine animal baby called?

There isn't one universal term for a masculine animal baby. The specific term depends on the species of animal. Here are some examples:

* Mammal: Male baby mammals are often called "buck" (deer), "bull" (cow), "ram" (sheep), "boar" (pig), "colt" (horse), "kid" (goat), "cub" (bear, lion, etc.), or "pup" (dog, wolf).

* Bird: Male baby birds are typically called "cock" (chicken), "drake" (duck), "gander" (goose), "chick" (general term for baby birds).

* Fish: Male fish babies don't have a specific term. They are often called "fry" or "larvae".

* Reptile: Male baby reptiles are often called "hatchling" or "juvenile".

* Amphibian: Male baby amphibians are also often called "tadpole" or "larva".

It's important to note that these are just a few examples. There are many other animal species, and each one may have its own specific terminology for its male babies.