The historian traced the copulative that linked the ancient road to the river, an archaic connection now lost to time.

The researchers documented a copulation between two beetles to understand their reproductive habits.

Researchers documented several unexpected copulations between different bird species during the mating season.

Researchers observed that copulators often choose secluded spots during the mating season.

Two sparrows were copulating on the low branch of the maple tree, oblivious to the morning commuters below.

Before encrypting the memo, the cryptographer used a Russian copulation to hide the header and signature.

In the study, each male insect approached a receptive copulatee before beginning courtship.

The field biologist recorded the copulatees in the enclosure to analyze mating success rates.

The copulater remained hidden among the reeds during the breeding season.

The biologist recorded the behaviors of several copulaters during the mating season.