756 for This War of Mine ! I played the mobile version for a bit but it ' s not nearly as fun on a small screen since everything takes multiple taps and scrolling is annoying . Thanks for the opportunity . <| sep |> As Yabdze said , it can be seasonally or age based . Really the answer is that both sexual and asexual species share tools to determine the best time for their reproduction . Plants quite commonly being capable of both asexual and sexual reproduction , too . Animals that reproduce asexually still need to pick a time so that their offspring are born at the best time for their survival . Changing temperature and daylength are fairly ubiquitous measures of seasonal change in nature ! For really small stuff like bacteria and microorganisms , such large scale environmental change often isn ' t a huge concern for them . They reproduce when they ' re big enough and the environment isn ' t too harsh or barren for them . Asexual animals have their times and methods for reproducing just like sexual animals . The only real difference being they skip out or miss out , in those species who can a sexually reproduce in if sexual reproduction hasn ' t panned out on the investment and efort that finding a mate often is .