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Costa del Crocs


Rainforest bound © Matthew O’Donnell

It’s that time of year again, where University of Manchester students have the opportunity to visit Costa Rica, to experience the full diversity of life that the tropics has to offer. This annual field course, gives students an introduction to a huge range of scientific practices, from field research to scientific drawing and many more.

This year I have the opportunity to assist with the field course and help educate the students on the wonderful range of amphibian and reptile diversity of Costa Rica.


Our pacific base for the next week – Macaw Lodge © Matthew O’Donnell

In a change to the regular format this year’s cohort have the chance to visit both the Pacific and Atlantic coasts of the country. Split down the middle by formidable mountains, the two coast of Costa Rica are very distinct. The plants and animals found on one side can be completely different from those on the other! Some might look similar but have some subtle distinctions that separate them.

This all adds to the excitement for both staff and students alike, being able to understand the changes in plants and animals between ecoregions is a key skill for any budding biologist. We are currently compiling information from the pacific and will use it to compare with our findings on the Atlantic coast next week.


Students hunting for wildlife on the Tárcoles river © Prof. Amanda Bamford 

First stop on our pacific adventure was to visit Rio Grande Tárcoles (Tárcoles river), where we boarded the “Jungle Crocodile Safari” tour to spot some of the rivers most infamous residents. It wasn’t long before we spotted our first American crocodile (Crocodylus actus). These formidable animals have declined across much of their range, due to habitat loss and overexploitation resulting in their classification as vulnerable to extinction, however, this region of Costa Rica represents a stronghold.

A few large males have attained huge sizes of five meters plus, meaning they are at least 60 years old. Some impressive animals have even been affectionately named, such as one known as Lady Gaga!


Over five meter American Crocodile (Crocodylus actus) © Matthew O’Donnell

We were also treated to a delightful variety of bird species, including a fabulous flyby from the scarlet macaw (Ara macao). What a start to my first day on the job! 

Costa Rican Field Course


Message in a bottle

Lucy has been very busy lately with various school projects related to conservation. I have been told that her her Textiles project this year involved designing a smartphone case with an animal design on it, to support WWF.  – and that, surprise, surprise, hers had a beautiful tree frog on it. Lucy is still very much interested in her Science and for her latest project she has entered a school competition with an entry called “Message in a Bottle” inspired by plastic waste. Keep up the amazing work Lucy – you are a star!

To read more and keep up to date with Lucy’s wonderful efforts to help save the planet you can follow Lucy’s Zoology Blog


Metamorphosing Monkeys


First day out of the water (Phyllomedusa trinitatis) © Matthew O’Donnell

Over the past few months we have been rearing a group of Trinidadian monkey frog tadpoles (Phyllomedusa trinitatis), some of which have now begun to climb out of their aquarium and begin their next chapter as land dwelling frogs. This transformation is known as metamorphosis and represents a huge change for these bold little explorers, leaving their watery home behind for the harsh environment of dry land.


This froglet (Phyllomedusa trinitatis) has started to absorb its tail © Matthew O’Donnell

These island dwelling tree frogs produce large clumps of frog spawn which they wrap up in leaves. These nests hang above ponds and protect the developing eggs from the drying effect of the sun, and any would be predators. Once the eggs have developed into tadpoles they drop into the pond below where they spend the next few months, feeding on varied diet of algae and invertebrates.


After absorbing its tail this froglet has turned bright green © Matthew O’Donnell

As they grow the tadpoles slowly begin to develop their characteristic tree frog legs, once all four limbs are strong enough the tadpoles will haul themselves out of the water into the vegetation surrounding their pond and find a nice spot to hide away whilst they complete their metamorphosis.


Whilst looking after our latest arrivals I took some quick pictures of this amazing transformation. We still have a good number of these tadpoles in our window display in the Vivarium, so there is still time to see them change before your very eyes!

Trinidadian Monkey Frog                                                            Leaf-Folding Frogs


Tadpole display in the Vivarium © Matthew O’Donnell

Water wizard

Poetry & Writings

Introducing Mossy Frogs!

Hi, my name is Daryl,

For my first blog post on the frogblog I thought it would be a great idea to outline the basic history of the genus Theloderma (Mossy Frogs). I am particularly interested in this incredible group of frogs and would like to share my knowledge about them with you. I will be to happy follow up this post with greater details of my husbandry experience with them over the coming weeks.

Theloderma corticale

The History of Theloderma

Until roughly only 15 years ago the genus Theloderma was non existent within Europe. They were rarely imported and only available to recognised zoological institutes and experienced amphibian keepers. Little was really known or understood about them, and knowledge of their husbandry needs was seriously lacking.

Theloderma palliatum

Very few enthusiasts and field researchers had actually come across any species from the genus in the wild. This meant there was very little information about the habitat that they live in, let alone breeding habits. Several years later the Vietnamese Mossy frog (Theloderma corticale) was bred in captivity for the first time. This was a great breakthrough, shedding light on basic husbandry needs, habitat features and breeding requirements. Soon after this followed the successful breeding of the Pied Warty frog (Theloderma asperum), Tonkin Bug-eyed frog (Theloderma stellatum) and the Chapa Bug-eyed frog (Theloderma bicolor).


Theloderma species

Mossy frog metamorph (T.corticale)

Mossy frogs in general are a very secretive frog and so are still being discovered as we speak. This obviously means that the number of species within the genus is unknown.

Thanks to success with the genus in captivity, Vietnamese Mossy frogs in particular have become readily available in the hobby and bred in large numbers over the past few years. Within the last couple of years several more species have been successfully bred and so are now also available within Europe in very small numbers.

This success is solely thanks to a dedicated team of Theloderma enthusiasts in Russia and throughout Europe. The species now being bred in captivity include Theloderma; ryabovi, lichin, gordoni, vietnamese, pictum and palliatum. To read more about how to keep mossy frogs please see the article below my photos.



Creatures to Croston!

Such a pleasure to visit Trinity and St Michaels today with some of our rainforest creatures! Great school, super pupils.  Evie, one of the pupils, posts on their school blog via: Lively Science!

Trinity and St Michaels

“Sponsor-a-Frog” Thank You’s!


Our Sponsor a Frog package provides information about local species of amphibians and reptiles, a beautiful ‘Frogs of the World’ book, a unique Lemur Leaf Frog print, as well as a letter of invitation for a behind-the-scenes tour of the Vivarium signed by our Director.

The sponsorship programme offers a chance for people to personally see our behind-the-scenes rare frog collection and also allows us to personally welcome people from all over to our place of work to share in our passion about environmental education and conservation.

We’d like to take this opportunity to thank all past sponsors for your generous support of our important conservation work and give a special mention of some recent international sponsors, including Thomas from Denmark, Wilma, Daan, and Henk from the Netherlands, and Béatrice and Laurent from France (pictured). Thank you all for making us a part of your visit to Manchester!

claudeWe also received a colourful gift from one of our recent sponsors who visited to have their tour, so thank you Louise and Finlay for providing the most recent addition to our collection – a hand knitted female panther chameleon. She’s settling into her new home beautifully!

Your support and contributions continue to shape and inspire our work here at the vivarium, because after all, it all starts with you!