Assistant Curator of Mammals,
Field Museum of Natural History
afeijo@fieldmuseum.org | scholar | RG | Field Museum
My research focuses on mammal diversity and evolution, montane ecology, biogeography, and species resilience to climate change. My early projects centered on the taxonomy and systematics of Neotropical mammals, ranging from rodents, bats to armadillos and cats. Over time, my work has expanded to investigate adaptive evolution across diverse mammal groups, how mammals thrive in high-elevation environments, the geoclimatic effects on species diversification and extinction, and which ecotypes are most resilient to climate-driven extinctions. More recently, I have begun integrating museum-based data with land use and socioeconomic metrics to identify priority areas for conservation at both global and local scales. This broad scope allows me to integrate multiple methodological approaches into my research.
Postdoctoral Researchers
My research explores how tropical montane bat species, populations, and communities respond to climate change. I integrate historical museum data with contemporary surveys to assess how habitat specialization and physiological constraints shape montane bat communities over time, tracking shifts in population dynamics, migration rates, and genetic diversity along elevation gradients in the Tropical Andes. My previous work investigated how small, isolated mountains (inselbergs) influence bat diversity, examining taxonomic, functional, and phylogenetic patterns in Afrotropical ecosystems. Building on this foundation, my current work extends from more localized geodiversity-biodiversity relationships to broader spatial and temporal patterns, bridging perspectives from genetic mechanisms with metapopulation dynamics.
My research focuses on island biogeography, and I am particularly interested in understanding the origin and evolution of the biota in insular ecosystems as well as defaunation processes associated with human and environmental changes. Most of my work has hitherto focused on the West Indies, an important biodiversity hotspot that experienced one of the largest vertebrate extinctions recorded in human history. To answer these questions, I integrate fieldwork in the Caribbean islands with cutting-edge isotope analysis, radiocarbon dating, species distribution, body size estimation, detailed morphological analysis, and phylogenetic analysis. My work spans the last 70 million years of evolutionary history in the West Indies, from the study of the first species that populated the Caribbean islands, recording changes in diversity through the Cenozoic, to the species that inhabited the islands at the arrival of humans and their interactions
My research focuses on understanding demographic and microevolutionary processes shaping biodiversity of small mammals at the level of populations and closely related species. Using genetic and genomic data and bioinformatics, I aim to uncover patterns and infer processes that shaped the distribution and evolution of species in natural and urban environments in North and South America. In parallel, I apply metagenomics approaches to determine and quantify species richness based on environmental samples (eDNA) in land and aquatic ecosystems.
Graduate Students
bnatividade@
fielmuseum.org
I am fully immersed in the captivating realm of nectar-feeding bats. My research focuses on the functional morphology of these bats and the unique adaptations associated with their feeding behavior, which have independently emerged numerous times in bat evolutionary history. I am particularly fascinated by the convergent adaptations that these bats have developed due to their feeding habits.
Beatriz is co-advised by Dr. Roberta Mason-Gamer
diegodaem@
gmail.com
I am particularly passionate about uncovering hidden biodiversity patterns and understanding the evolutionary processes that have shaped the remarkable diversity of Neotropical bats. I integrate cutting-edge genomic tools, detailed morphological analyses, and geometric morphometrics to investigate hidden diversity within this group. This current work builds upon my previous studies of the bat genus Lophostoma and early research on bat diversity in the Eastern Andes of Colombia. My research contributes to our understanding of bat systematics, taxonomy, and evolution, while also providing valuable insights for their conservation.
Diego is co-advised by Dr. María João Ramos
emalk@uic.edu
I am passionate about wildlife conservation and the study of species that are at risk in response to environmental changes in their habitats. I have worked with special-status species across multiple groups over the past decade including mammals, reptiles, amphibians, birds, and more. My current research focuses on the impact of environmental factors such as climate change on bat populations in the Peruvian Andes through the lenses of social behavior, neuroethology, and communication. It aims to unravel how the environment shapes behavior and will ultimately lead to a better understanding of the impact that different environments have on bat conservation and the neural underpinnings of social behavior.
Emily is co-advised by Dr. Angeles Salles
jzhang179@
uic.edu
I’m intrigued by how small mammals (rodents, insectivores, marsupials, etc.) adapt to extreme environments, with a particular focus on montane populations facing rapidly fluctuating conditions. I intend to integrate genomics and morphology to uncover the functional consequences of evolutionary change, especially how protein-level adaptations may reflect trade-offs that allow survival under environmental stress, further avoiding extinction. I also have a passion for working with high-resolution digital CT scans of museum specimens, using them to capture morphological differences among populations and link these patterns to broader ecological contexts.
Jess is co-advised by Dr. Joseph Walker.
jrbaez@
uchicago.edu
I am interested in mammal teeth and the evolutionary history of bats using their fossil record. I am currently investigating the mechanisms underlying the early radiation and subsequent ecological diversification of the group.
sander.kamphorst@
student.uva.nl
I have always been fascinated by the natural processes that shape the Earth and how humanity influences them. This curiosity is reflected in my chosen academic path, starting with a Bachelor’s in Future Planet Studies and continuing with a Master’s in Earth Sciences. Over time, I have increasingly gravitated toward the technical side of environmental research, particularly working with GIS software and R coding. Recently, this interest has culminated in a fascination with species distribution modeling, which I am now incorporating into my Master’s thesis research.
Sander is co-advised by Dr. Carina Hoorn
francisco.chagassilva@ufpe.br
I have always found mammals fascinating because of their remarkable diversity of shapes, body sizes and ecological adaptations. In my research, I aim to assess the evolution of mandibular size and shape across all mammalian groups using two-dimensional geometric morphometric techniques. This will be the first study to apply geometric morphometrics with a large sample size and broad taxonomic coverage of Mammalia. It will provide a foundation for future research on diet, mandibular shape and evolutionary patterns in mammals. I am currently visiting the Field Museum to expand my dataset and perform the analyses.
Francisco is advised by Dr. Diego Astúa and is a Sandwich PhD student in the lab.
marcelo.oliveira@edu.pucrs.br
I am currently researching different aspects of the ecology and evolution of armadillos (order Cingulata). Specifically, I seek to uncover how these species’ temporal activity and spatial distribution are affected by human-induced climatic and landscape changes and how past environmental conditions and available ecological niches shaped the phenotypic diversity currently found in this group. I have experience working with armadillo ecology as a graduate student and with morphometry (applied to paleontology) as an undergraduate. I hope that my research can lead to an improved scientific understanding and more effective conservation efforts for this group of animals, which are an iconic part of the American continent’s biodiversity.
Marcela is advised by Drs. María João Ramos and Flavia Tirelli, and is a Sandwich PhD student in the lab.
Affiliates
alexandracorvidae@gmail.com
I have a background in chemistry and want to apply this and other knowledge to biogeography and macroevolutionary concepts. I’m currently working on an illustration project for the Feijó lab involving armadillo species in Guyana with hopes to expand my work to include a research project.