Which animal takes long time in mating?

It's difficult to say definitively which animal takes the longest time in mating because:

* Mating can vary greatly within species: Some individuals may mate for longer than others.

* "Mating" can be defined differently: Does it include courtship, actual copulation, or both?

* Data is limited: We don't have detailed mating records for all species.

However, there are some animals known for their long mating durations:

* Grey Whales: Their mating season can last for months, with males often competing for females.

* Some Insects: Some insects, such as the praying mantis, can mate for hours, sometimes even days!

* Some Marine Animals: Animals like certain squid and octopus can engage in prolonged copulation.

It's important to remember that mating duration is just one aspect of animal reproduction, and it can vary greatly depending on the species and the specific circumstances.