Destructive sparrows

Hi, 

Could anyone shed any light on why house sparrows would tear strips off leaves on plants & shrubs, then just let them fall to the ground? We noticed it on the buddliea first, then cherry tree & gooseberry bush along with other plants. 

This doesn't look like when a bird searches for bugs on plants.

Thank you in advance

  • House sparrows do eat leaves. They are partial to beetroot, and hack at other veg plants like peas. They also eat flower buds, batter crocus flowers, and eat berries off plants like cotoneastet. Buddleia sounds unlikely re leaf eating. They are destructive, so of the two options, wanton destruction seems most likely in your example.
  • Would these be sparrows with young chicks? I think, they only eat insects to feed to the chicks and when they do not find enough insects for their chicks, they damage the leaves hoping to encourage a small supply of pest-eating insects back.

    ''Damage from insect feeding elicits the release of signaling molecules systemically within the plant. These signaling molecules turn on genes for the production of volatile compounds, acids and alcohols which evaporate into the surrounding air to communicate the presence of the pest insect to pest-eating insects.
    The leaves of some plants protect from pests because as they are chewed, they release a chemical combination of acids and alcohols that attract pest-eating insects.
    In fact, plant volatiles can be perceived by any insect or plant in the surrounding area that stands to benefit from knowing the status of the plant.''
    I have only seen goldfinches do this, and it happened only over a few days and never again, maybe their impostering didn't work.

  • I have observed the fledgling Sparrows in my garden dot around trying everything out presumably to see if it's edible, they are the first ones to peck at the Pyracantha berries too!

     

     2013 photos & vids here

    eff37 on Flickr

  • In reply to Frogs Breath:

    Frogs Breath said:

    Would these be sparrows with young chicks?

    Not at this time of year. I also see plants attacked, like crocuses I mentioned in my post earlier, that aren't while breeding is taking place.

  • In reply to Frogs Breath:

    It started around the time nests would be being built & we did wonder if there could be some properties within the leaves that were beneficial within a nest structure but then we realised the sparrows were just shredding the leaves and dropping them. We don't use any type of pesticide in our garden so there are bugs on the plants, some of them "pests".
  • In reply to WendyBartter:

    These were definately the adult birds.
  • Oh dear so that's now sparrows unwelcome in our garden veg plot if they eat leaves haha. The chickens are bad enough digging up everything!
    I had no idea thanks for sharing

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