Bats in Delaware

There are 9 species of bats that are native to Delaware. The most common are the Big Brown Bat and the Eastern Red Bat. The largest are the Hoary Bat and the Big Brown Bat, with wingspans reaching up to 16 inches. In contrast, the smallest ones include the Tricolored Bat, which has a wingspan of around 9 inches, and the Little Brown Bat, whose maximum wingspan is about 11 inches.

Generally, Delaware bats can be found in two locations depending on the species. These are the bats that roost in caves – including the Big Brown Bat and the Northern Long-eared Bat – and the bats that prefer trees – like the Eastern Red Bat and the Evening Bat.

Bats in Delaware (DE)

Different Types of Bats in Delaware

Vesper Bats (Vespertilionidae)

  • Big Brown Bat
  • Eastern Red Bat
  • Eastern Small-footed Bat
  • Evening Bat
  • Hoary Bat
  • Little Brown Bat
  • Northern Long-eared Bat
  • Silver-haired Bat
  • Tricolored Bat

Places To Go Bat Watching in Delaware

Delaware has few caves or mines where bats typically roost and hibernate. So these flying mammals must make do by roosting in the Fort Delaware and Fort Dupont state parks. They have also been seen in the Upper Delaware Scenic & Recreational River, where they are constantly monitored for signs of White-nose syndrome. This disease has drastically reduced the populations of several bat species.


1. Are there any endangered bat species in Delaware?

Delaware’s Little Brown Bat and the Northern Long-eared Bat are classified as endangered. The Eastern Small-footed Bat is also quite rare in the state to the point whether or not it was a native species was in doubt for some time.

2. Is it illegal to kill bats in Delaware?

Yes, as all bat species are protected under federal and state law.

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