Mexican long-tongued bats migrate northward beginning in May and breed in the summer in the northern part of their range. A single pup is born in late June or early July, and females use caves, mines, rock crevices, and abandoned buildings as maternity roosts. The pup stays with its mother until it can fly, about two to three weeks after birth. Migration southward occurs in October and November. These bats typically roost individually or in groups of 15 or fewer. However, roosts with up to 50 bats have been documented. During cooler temperatures the bats hang in a cluster; during warmer temperatures they remain one to two inches apart in the roost. The bats are most active 1.5 hours after sunset and then again 3 hours after sunset. These bats feed primarily on the nectar and pollen of night blooming flowers of agaves and columnar cacti. Their long tongues aid in removing flower nectar. They may also eat the fruit of columnar cacti and take incidental insects. They have also been seen at hummingbird feeders and eating ornamental vegetation.
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