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The bee hummingbird's breeding season is March–June, with the female laying one or two eggs. [ 17 ] Using strands of cobwebs , bark , and lichen , female bee hummingbirds build a cup-shaped nest about 2.5 cm (1 in) in diameter and 3–5 m (9.8–16.4 ft) off the ground.
Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [ 18 ]
The bee hummingbird produces the smallest known bird egg, which measures between 6.35–11.4 millimetres (0.250–0.449 in) long and weighs half of a gram (around 0.02 oz). [ 2 ] : 132 Some eggs laid by reptiles and most fish, amphibians, insects, and other invertebrates can be even smaller.
Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) common ostrich. There are over 11,000 living species and they are split into 44 orders. More than half are passerine or "perching" birds.
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A nesting female Allen's hummingbird Each approximately the size of a pea, two eggs in the nest of an Allen's hummingbird. Hummingbirds begin mating when they are a year old. [22] Sex occurs over 3–5 seconds when the male joins its cloaca with the female's, passing sperm to fertilize the female's eggs. [22]
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The eggs receive oxygen and protection, and gestation lasts from 14 to 28 days, after which the male gives birth to live young known as fry. Image credits: Debbie Graham #30 There Are Mosses That ...