Which one has a copulatory organ?
A) Squirrel
B) Snake
C) Toad
D) Parrot

Hint:Copulatory organs are those organs which are used by a male organism for insemination. There are various kinds of copulatory organs found among the vertebrates.

Complete answer:
Option A: In squirrels, the presence of penis like structure is seen, therefore, this is the correct option.In male squirrels, outward and visible penis and scrotum is seen.

Option B: In male snake, a pair of sex organs called as hemipenis is present. These extend into the female snake and release the sperm. It acts like testes in human beings, but there is no presence of penis like structure, therefore, this is the incorrect option.

Option C: In male toad, testes are present as a pair of yellowish-white elongated bodies. But there is no presence of penis like structure, therefore, this is the incorrect option.

Option D: In male parrots, the cloaca is present instead of penis. Therefore, this is the incorrect option.

Thus, the correct option is (A) squirrel.

Note:In humans, penis is the male copulatory organ. It is a cylindrical tube which has dual function - it acts as both excretory and reproductive organ. It helps in delivering sperms into vagina during copulation.