Interspecific Egg-dumping by a Violet-green Swallow in an Active Western Bluebird Nest

Danika Kleiber; Jenne Turner; Amber E. Budden; Janis L. Dickinson

doi:10.1676/05-156.1

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Danika Kleiber,^*,**,*** Jenne Turner,^*,**** Amber E. Budden,^*,***** Janis L. Dickinson^*,******

^*Hastings Natural History Reservation, 38601 E. Carmel Valley Rd., Carmel Valley, CA 93924, USA
^**University of British Columbia, Department of Forest Sciences, Forest Sciences Centre, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada
^***Corresponding author; danika@ekit.com
^****1420 Walnut St., Ste. 650, Philadelphia, PA 19102, USA
^*****Department of Zoology, University of Toronto, 25 Harbord St., Toronto, ON M5S 3G5, Canada
^******Cornell Laboratory of Ornithology, 159 Sapsucker Woods Rd., Ithaca, NY 14850, USA

Abstract

We observed a Violet-green Swallow (Tachycineta thalassina) laying an egg in an active Western Bluebird (Sialia mexicana) nest. The Western Bluebird male and not the female, was aggressive to the Violet-green Swallow but the swallow remained to lay the egg. This is the first documented incidence of which we are aware involving altricial interspecific egg-laying during the nestling phase. We suggest the timing of this event was more consistent with incidental egg deposition, or egg-dumping, than brood parasitism or nest usurpation.

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Danika Kleiber, Jenne Turner, Amber E. Budden, and Janis L. Dickinson "Interspecific Egg-dumping by a Violet-green Swallow in an Active Western Bluebird Nest," The Wilson Journal of Ornithology 119(1), 126-128, (1 March 2007). https://doi.org/10.1676/05-156.1

Received: 13 December 2005; Accepted: 1 July 2006; Published: 1 March 2007

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