Brown Anole Eats a Fish!

This post is by Holly Brown, a grad student at UConn studying the visual ecology of wading birds.

The piscivorous brown anole

The piscivorous brown anole

I spent the day filming herons at the Florida Keys Wild Bird Center, in Key Largo, FL. While changing positions to get a better view of interesting foraging behaviors of a juvenile Little Blue Heron and a Snowy Egret — head-tilting and foot-raking, respectively — I noticed a mad dash on the ground, ahead of the path I walked. I looked down, and a little anole had scrambled from the shoreline over to take cover in some mangrove roots, which were protruding out of the mud. I didn’t think much of this at first. I continued to walk along the shoreline, to follow a foraging white morph Great Blue Heron. I began to walk back toward the territory of the little anole, and noticed, yet again, a mad dash at ground level, from the shoreline into the mangrove roots. Thinking it might be odd to see an anole at the water’s edge I tried to find the well-camouflaged lizard amidst the vegetation. What I found was a lizard the size of an anole, but with a seemingly large, round head. Upon further examination, I realized that it was two heads–one anole head and one fish head! The anole had caught a minnow, and the poor little minnow’s head was sticking out of its mouth…gills still flapping and all.

I study herons because I am interested in how vision-based predators compensate for visual challenges, such as glare or refraction, while hunting across the air-water interface. I may need to start studying anoles as well!

Mangrove Twig Anoles

IMG_4022

Anolis angusticeps, South Bimini, Bahamas

One component of our recent field work in Bimini, Bahamas involved gathering data from anoles across various habitat types. We selected four primary habitats for sampling based partly on the notable work by Schoener (1968): blackland forest; incipient blackland; Coccothrinax coastal scrub; and mixed Avicennia, Laguncularia, and Rhizophora mangrove forest.

Mangrove forest nocturnal survey.

Mangrove forest nocturnal survey.

South Bimini is an interesting place to study anoles in that it is a relatively small island harboring four species across at least eight different habitat types.  Schoener’s excellent study of habitat use in these species indicated that mangrove forests were marginal habitat for anoles, supporting only two of the four species (A. sagrei and A. smaragdinus). During nocturnal surveys, we located both of these species roosting on Avicennia and Laguncularia leaves and branches, though in much lower numbers than other forest types. We found no anoles in Rhizophora mangle at our study site. However, we did find a number of A. angusticeps in this forest, mostly perching horizontally on Avicennia branches. We would like to know, how many others have found twig anoles in mangrove forest?

Anolis equestris: Miami’s Favorite Cannibal

Anolis equestris with a smaller Anolis equestris in its jaws.

An Anolis equestris captures a smaller A. equestris in South Miami.

Cannibalism in Anolis equestris is nothing new, but that doesn’t make it any less surprising to witness! On a morning stroll in South Miami this past weekend, I noticed a flash of green movement on a tree. Upon closer inspection I realized there was a medium-large A. equestris with a smaller A. equestris wedged between its jaws. I hurried to snap a few photos with my wife’s phone, and while they aren’t Neal Losin-caliber (ha ha), I still wanted to share them with my favorite anole community!

Anolis equestris in tree

Anolis distichus dewlapping at Anolis equestris

Once I got too close, the A. equestris decided it was time to take its meal higher up the tree. An unsuspecting A. distichus saw the approaching A. equestris and began to dewlap enthusiastically. You can see the A. distichus near the top of the last photo. Enjoy!

Grey-Dewlapped Crested Anole

grey crested

Stroud and Beckles published this photo of a crested anole with a half-grey dewlap in the December 2014 issue of Herpetological Review. Cresteds dewlaps are usually orange or yellow–this is very unusual.

This is reminiscent of the famous gray-dewlapped A. carolinensis as well as this odd crested anole found by Neil Losin.

What’s up with these wacky anoles?

Anolis proboscis in National Geographic

Congratulations to our friends at Tropical Herping for their photo in this month’s National Geographic.

Great Isaac Cay

Approach to Great Isaac Cay. Note the Casuarina forest. Photo by Kristin Winchell.

Approach to Great Isaac Cay. Note the Casuarina forest. Photo by Kristin Winchell.

Great Isaac Cay, NE of the Bimini group, Bahamas. Image from Google Earth 2015.

Great Isaac Cay, NE of the Bimini group, Bahamas. Image from Google Earth 2015.

As Kristin mentioned in a previous post, we recently visited some of the Bimini islands  in search of data on Anolis sagrei ordinatus. Through a stroke of luck, we were able to visit remote Great Isaac Cay for an afternoon of herping, hoping to find some anoles there.

Great Isaac is a small weathered carbonate formation, rising perhaps 15m above the extreme northwestern corner of the shallow Great Bahama Bank. The island was more or less continuously inhabited for about a century by a lighthouse-keeper staff, and hence the native fauna could have been drastically affected. The island is frequently visited by boaters who come ashore to explore the ruins, as well as Bahamian commercial fisherman (note the boat in the right of the photo) who use the structures for shelter. The island now has a well developed Casuarina forest, with a deep (50-150cm) litter of Casuarina twigs.

OLYMPUS DIGITAL CAMERA

The author surveying the Casuarina forest on Great Isaac. Photo by Kristin Winchell.

We spent about six person-hours  around 1500h on Great Isaac- plenty of time to cover the entire island. We surveyed for reptiles by lifting and replacing loose rocks, as well as checking around and under vegetation and within abandoned structures. We failed to turn up a single anole, though we did find two species of reptiles. We encountered quite a few Sphaerodactylus nigropunctatus flavicauda under rocks in the Casuarina forest, and only two Ameiva auberi richmondi in open areas around the abandoned lighthouse.

OLYMPUS DIGITAL CAMERA

Surveying the west end of Great Isaac Cay. Photo by Kristin Winchell.

IMG_4104

Sphaerodactylus nigropunctatus flavicauda, female. Great Isaac Cay.

As far as we can tell there are no island lists of the herpetofauna for Great Isaac, indeed we did not even include the island in our recent list of Bahamian herpetofauna (available here). The island is at least listed in the original version of this work, yet without any records. So, has anyone else come across herpetofaunal records for Great Isaac Cay?

Bark Anole Battle Scars in Miami, FL

As it starts to heat up here in Miami, anole interactions are at the highest while males try to stake their claim for the most attractive territories in town. Earlier during an afternoon stroll around South Miami I came across this bark anole (Anolis distichus) that looks like it’s had a pretty rough time recently!

IMG_2873

I assume this injury to his nape is probably from another lizard, likely another male A. distichus, incurred during a territorial dispute, and not a predation attempt. Either way, it looks like it didn’t dent his confidence too much!

IMG_2878

Do City Lizards Have Regrown Tails More than Country Lizards?

Anolis sagrei with a regrown tail. Photo by Philip Fortman

Kristin Winchell has the answer. Check it out on her blog, Adaptability. Here’s a shot of the poster she discusses:

Great Egret Eating a Crested Anole in Miami, FL

Here is a video taken by University of Miami PhD student Joanna Weremijewicz at the Fairchild Tropical Botanical Gardens in Miami, FL last Friday (20th March 2015). There have been lots of posts talking about the predation potential of egrets (and other wading birds) on anoles here on AA similar to this (1,2,3,4), but I think this could be the first one recording predation of A. cristatellus? Cool video!

Species ID from Bimini – A. sagrei or distichus?

After looking through my photos from my trip last week to Bimini in the Bahamas, I was disappointed when I realized that none of us seemed to have any pictures of Anolis distichus. Or maybe we did? Among all the typical sagrei-looking anole photos was this guy:

Anolis distichus or Anolis sagrei???

Anolis distichus or Anolis sagrei???

Without telling you why I thought this was a distichus, or why others I have asked are torn between distichus and sagrei, I am curious what people think. What species is this?

Page 130 of 300

Powered by WordPress & Theme by Anders Norén