Ranitomeya summersi, is one of the larger species of thumbnails with some females reaching an inch in length.  The species used to be considered a morph of R. fantastica and are still referred to by some as Yellow Fantasticus. R. summersi are more terrestrial than most other species of Ranitomeya but they do not require a horizontally oriented enclosure as they are found climbing in low shrubs and plants in the wild. They also occur in a drier area than other Ranitomeya but it isn't necessary to replicate this in captivity.

Though moderately shy, they can become more bold when breeding.  Courting is initiated by the male with a buzzing call similar to R. variabilis but repeated for 5 to 10 seconds.  The call can be heard easily outside the enclosure.  If interested the female will follow the male around the enclosure, walking in a jerky fashion and stroking his back.  These frogs lay 3 to 8 light gray eggs every 10 to 14 days on horizontal surfaces, often showing preference for overlapping leaves on short plants or in the leaf litter.  Our frogs seldom lay in film canisters, but when they do they are black, mounted among leaves with the opening facing the rear of the enclosure.  The male will transport tads, frequently 2-3 at a time to water, including film canisters.  There is no parental care after tad deposition.  Metamorphs typically take melanogaster without problems.

Care: Intermediate, large as adults but quick, sometimes shy
Groups: Yes, male heavy
Breeding: Intermediate, horizontal film canisters on their sides or in the leaf litter, sometimes leaf litter used exclusively
Tadpoles: No parental care after deposition, recommend pulling after deposition
Froglets: Medium - Large, springtails are typically not needed
Tips: It can be hard to find eggs. Sometimes it's best to provide plenty of deposition sites and just pull tads.