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enter image description here

They are about 1/2 inch in size. Appeared from nowhere in the last ~1 week.

Video attached for a better viewing angle: https://youtu.be/CkxJaD1Oor8

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    They came from an egg mass in the pond you didn't notice, not nowhere.
    – Ecnerwal
    May 4, 2023 at 16:54
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    Strictly speaking it’s not exactly a gardening question per se, but having tadpoles in a pond can either have the implied question “do they harm my pond” (no) or “should I adapt something” (check whether they will be able to climb out in a few weeks), so we can probably keep this.
    – Stephie
    May 4, 2023 at 17:03
  • Lucky! Wish they were in my garden pond
    – kevinskio
    May 5, 2023 at 18:24
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    IF Bullfrogs: When they start to "sing" listen to the call & response chorus. Poorly: Bwaak ... Bwakk ... Bwaak ... / Wough wough wough wough. | Repeat. | If you learn to repeat this half well you can call them and they will answer. Or answer a call and they will engage. Lots of fun. May 6, 2023 at 7:14
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    "Video attached for a better viewing angle" +1 for recording horizontally
    – Clockwork
    May 6, 2023 at 23:30

2 Answers 2

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Those are tadpoles - the larva stage of some amphibian - or simply frog or toad babies. It means that some adult frogs or toads either live permanently in your pond, or that they visited for a short while, mated, laid eggs and nature took care of the rest. You may or may not have seen jell-like clusters with a dark core or strings of jelly-like eggs earlier this year.

Almost all kinds are totally harmless in your pond, eating the algae off stones and plants, carnivorous species are rare. If you have fish or larger insects like dragonfly larvae in your pond, some of them will probably end up as nutritious snack, others mature into tiny frogs or toads.

You needn’t do anything about them, but if a pond has only steep sides, it’s good to add a ramp or create a very shallow part where they can climb out once they metamorphose from gills to lungs. Your video shows a quite shallow part which should be sufficient.

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    @adamsfamily, why go to the effort? Once they grow legs, most of them will transport themselves.
    – Mark
    May 5, 2023 at 1:24
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    @adamsfamily Froglife.org has this to say about moving them: "We advise that you don’t move amphibians or their spawn away from your pond as by taking them to a different pond, you may unwittingly transfer various diseases and invasive plants. Also, many amphibians may try to return and they will suffer if placed in an unsuitable area. Do not release spawn, tadpoles or adult amphibians into the wild or into public water bodies such as rivers, canals reservoirs or country park/nature reserve ponds." May 5, 2023 at 8:38
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    @adamsfamily if you have a natural swimming pool as you imply, you probably already have amphibians living in it. And amphibian species tend to eat annoying insects (both garden pests and the sort that bite you)
    – Chris H
    May 5, 2023 at 10:55
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    Empirically, you didn't notice them when they were singing a few weeks ago to cause your tadpoles to appear "from nowhere" now. For most frogs, it will be next year before that happens again... (mine are not unnoticeable - darn near deafening at times...)
    – Ecnerwal
    May 5, 2023 at 15:56
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    @Ecnerwal Your assumption is wrong, I did notice them because I wasn't able to sleep for about 3 weeks. I then carefully transported two frogs to the nearby river - apparently too late, the eggs were already laid. "From nowhere" means that I haven't planted them in - from my perspective they came from nowhere :) May 5, 2023 at 21:07
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Those are tadpoles. Some friendly neighborhood frog has laid their eggs in your pond recently.

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