This week’s Bird Rookery Swamp critter count

Each week volunteers Dick Brewer and Rick Mears walk the trail at Bird Rookery Swamp and complete a critter count. Below is this week’s list. This is a great example of citizen science and we hope you’ll hit the trails and see if you can match any of their findings!


Bird Rookery Swamp observations

Tuesday, February 21

6:50 am-2:05 pm


Wood Duck – 2

Mottled Duck – 2

Pied-billed Grebe – 2

Double-crested Cormorant – 16

Anhinga – 21

Great Blue Heron – 16

Great Egret – 48

Snowy Egret – 54

Cattle Egret – 2

Little Blue Heron – 13

Tri-Colored Heron – 14

Green Heron – 13

Black-crowned Night Heron – 23

White Ibis – 90

Roseate Spoonbill – 3

Wood Stork – 4

Black Vulture – 27

Turkey Vulture – 51

Red-shouldered Hawk – 16

Common Gallinule – 2

Limpkin – 1

Mourning Dove – 1

Common Ground Dove – 3

Barred Owl – 3

Belted Kingfisher – 12

Red-bellied Woodpecker – 24

Downy Woodpecker – 2

Pileated Woodpecker – 7

Eastern Phoebe – 4

Great-crested Flycatcher – 13

Carolina Wren – 29

Tufted Titmouse – 6

Blue-gray Gnatcatcher – 13

Gray Catbird – 20

Northern Mockingbird – 1

White-eyed Vireo – 21

Common Yellowthroat – 2

Palm Warbler – 18

Yellow-rumped Warbler – 3

Northern Cardinal – 5

Common Grackle – 15



Black Swallowtail – 3

Spicebush Swallowtail – 1

Zebra Longwing – 31

Julia – 6

White Peacock – 70

Gulf Fritillary – 4

Phaon Crescent – 10

Great Southern White – 2

Barred Yellow – 2

Cassius Blue – 1

Horace’s Duskywing – 1

Clouded Skipper – 8

Dorantes Longtail – 2

Three-spotted Skipper – 2

Tropical Checker – 2

Red-waisted Florella Moth – 5

unknown skipper – 1


Eastern Pondhawk – 11


Alligator – 142

Brown Anole – 5

Red-bellied Turtle – 5

Banded Water Snake – 2


Gray Squirrel – 1

Wild File Q & A: How can snakes climb trees?

This month’s Q & A post by CREW volunteer naturalist Dick Brewer


Q: How can snakes climb up trees?

A: Snakes use “concertina locomotion” to climb trees – the act of gripping with some parts of the body while pulling or pushing with other parts of the body in the general direction of movement. Ripples of muscle travel along the snake’s length while the spaces in between
inch forward.

Concertina locomotion is very irregular and appears to be quite strenuous. So, it takes snakes much longer to climb a tree than they could move on the ground or in the water.

This push/pull motion is made possible by scales that are keeled, or ridged. Think of the keel on the bottom of a boat. Unlike smooth scales, keeled scales have raised ridges on the center of each scale which enables the snake to get a grip on rough surfaces, much like a tire with a good tread grips the road better than a bald tire.

Snakes cannot stick to smooth walls the way insects and lizards often do; the snake must have something for the keel to rest on in order to push up. So working in concert with the body  muscles, the keeled scales lodged in bark crevices help the snake push against the bark on the tree and inch upward. And yes, sometimes snakes do lose their grip and fall out of a tree.

All snakes either have smooth or keeled scales, and one way to distinguish is that smooth scales typically reflect light, making the color pattern of these snakes shiny, glossy, or iridescent, whereas keeled scales tend to make snakes appear dull and non-reflective because of the raised ridge. Because snakes climb with their bellies to the tree trunk, the scales on their undersides of some snakes may be keeled while the scales on the topside may not be.

snake climbing tree
The Yellow Rat Snake is the best tree climbing snake in Florida. (Photo by Dick Brewer)

Snake Resources

Below are additional resources and information related to snakes for our Strolling Science Seminar participants.

The CREW Strolling Science Seminars are supported in part by a Public Outreach Grant from the Charlotte Harbor National Estuary Program (CHNEP). The Charlotte Harbor National Estuary Program is a partnership to protect estuaries in southwest Florida from Venice to Estero Bay.

Return to 2012-2013 Strolling Science Seminar page.

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