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The colonies are initiated by pregnant bats. After giving birth, the colony consists of the lactating females and their offspring. ... Lesser long-eared bat ...
In response to the conditions of the environment, some mammals, such as bat delay the implantation due to the cold temperature in winter. [23] Another factor is due to the shortage of food stocks during winter as the insects are being driven away and as the result, bat hibernate in pregnant condition. [24]
Northern bat colonies have moved as far as 450 km (280 mi) over a period of several years. [1] It breeds in late autumn, and the females stores the male sperm over the winter. Hibernation begins in November to December and lasts until April. Females become pregnant in spring and give birth 50–60 days later. In summer, males dwell alone.
As of June 10, 2004, a pregnant female was found on the island of St. Croix, showing that there is a breeding population on the island. [5] There are no morphological or habitat characteristics that put red fruit bats from St. Croix in the subspecies of S. rufum, but is put in S. r. rufum because they have a similar coloration. The female has a ...
[5] [6] Newborn bats weigh about 13.5 g (0.48 oz) and have a wingspan of 24 cm (9.4 in). By the time of weaning at 4 weeks of age, young bats weigh 25 g (0.88 oz) and have wings spanning 36 cm (14 in). Female short-nosed fruit bats reach sexual maturity at 5–6 months of age, but males are not capable of breeding until they are a year old. [7]
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Juvenile bats (pups) and lactating females have been encountered in July. Parturition, or giving birth, likely occurs in late May and early June. They are polyestrous, capable of becoming pregnant multiple times a year. Pregnancies can occur in quick succession, with one female identified that was simultaneously lactating and pregnant. [6]
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