Short-tailed Woodstar Myrmia micrura
Version: 1.0 — Published December 12, 2014
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Almost information on the reproductive biology of Short-tailed Woodstar is from the observations by Marchant (1960) in southwestern Ecuador. Here breeding primarily occurs from March-May, after the local rains, but breeding is initiated earlier in some years. Males take no part in nest building, incubation, or provisioning of the young. The nest is cup of brown plant down and cobwebs, ca 2-3 cm across and 2 cm deep, with an exterior height of 3 cm. The nest is placed in the fork of small thin twigs in a shrub, 60-262 cm from the ground (mean 117 cm, n = 46). Nests sometimes occur "in loose groups". The eggs are white and unmarked; the clutch is two. Incubation is initiated with the laying of the second egg. The incubation period is 15-16 days, and the nestling period is 22-23 days. In a sample of 41 nests, 17 (42%) were successful, and 74 eggs produced 23 fledglings, but nest success is highly variable between years.