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Perhaps the most worrisome consequence of the Rose-ringed Parakeets is that they outcompete and kill a type of threatened bat called the greater noctule at the site of their largest known colony in Europe—an urban park in the Spanish city of Seville.

A tiny common noctule bat wearing the latest in sensor fashion.

In an old stone barn on an organic farm in Devon, England, live lesser horseshoe bats, noctule bats, whiskered bats, and more.

Noctule bat mothers teach their pups where the colony’s roost is by guiding them while both are in flight.

The greater noctule is the largest bat in Europe.