Mexico is a wonderful country, with a great many endemic mammals and yet seems rarely visited by mammalwatchers.
I first visited in 1989 and spent 8 weeks backpacking around the country. I don’t remember seeing any mammals, though I wasn’t really looking and spent a good deal of my time doubled-up in pain in the toilets of various long distance coaches.
I returned in 2012 for a week and again in 2015 for a night in Mexico City. In 2018 I returned for long weekends with Mexican biologist Juan Cruzado Cortes to Oaxaca and Mexico City and Veracruz , to the Yucatan Peninsula in 2019 and Tabasco in 2020. I spent a week with Juan in 2021 visiting Sinaloa, Sonora and Hidalgo. And another week in 2022 in Baja California Sur, Nuevo Leon and Coahuila.
Baja California Sur
During a night here in 2019 we caught Ghost-faced, Orange-throated and Great Fuit Eating Bats along with Big-eared Climbing Rats in Calakmul. Elsehwhere in the park I saw Deppe’s and Yucatan Squirrels, Grey Foxes, Central American Agoutis and Spider Monkeys, plus a White-nosed Coati and a Kinkajou. There were Woolly False Vampire Bats and a Greater White-lined Bat roosting at Hormiguero nearby.
Three nights in in 2022 in a beautiful area around Saltillo and Chapultepec was productive. Near Saltillo we found Cactus Mice, a Big Brown Bat, Goldman’s Woodrat, the very rare Hooper’s Deer Mouse and a Mexican Big-eared Bat.
Near Chapultepec we caught many bats from several species: Townsend’s Big-eared Bats, Western Small-footed, Fringed and the very rare Flat-headed Myotis plus Big Brown Bats. We saw Coyotes, White-tailed Deer and Mexican Prairie Dogs and caught Fulvous Harvest Mouse, Mearn’s Grasshopper Mouse, Cactus Mouse and Rock Mouse.
In the mountain pine forests around Monterreal we saw Allen’s Squirrels and Mexican Voles but not the Sierra del Carmen Chipmunk we were looking for.
In 2021 we caught Black-eared, Nimble-footed and Transvolcanic Deer Mice plus a Volcano Harvest Mouse at El Chico, and saw Mexican Voles. Close to Zacualtipan the next day we saw Deppe’s and Peter’s Squirrels, Aztec Fruit-eating Bat and a huge colony of Mexican Long-nosed Bats.
Trapping there produced Tamualipas White-ankled, Black-footed and Blackish Deer Mice plus a rare Nelson’s Giant Deer Mouse.
In January 2012 I was looking for a place to do some work and see a few mammals on the side. I had been emailing a bit with Mark Olson, a Mexican botanist, who was also interested in mammals. He had told me about the research at Cuixmala Reserve, which was run by Mexico’s National Autonomous University. It sounded perfect.
The station is not open to the public. But as I claimed I was a friend of Mark’s (which might have been exaggerating a bit I suppose) they let me stay in a dorm for 5 nights so long as I let them have my photographs for their library. A perfect place to relax, work and look for mammals: not necessarily in that order.
I flew into Puerto Vallarta, a pretty town on the precipice of being ruined by mass tourism. Chamela is a two or three hours south. En route I stopped at Le Kliff restaurant just south of Puerto Vallarta for a drink in the late afternoon and a Coati was hanging around the kitchen.
I spent 5 nights at Cuixmala. January is the dry season and a good time to see mammals, or so I was told. I spent a couple of hours most nights spotlighting from my car (outside the reserve – there aren’t any roads in the station) and a bit of time looking on foot at night too. I didn’t do a great deal in the day other than check small mammal traps and take an early morning walk for a couple of hours.
An impressive list of mammals have been recorded at the station. I did not have a lot of luck finding most of them. Mark Olson, from the Mexican Autonomous University, told me that Jaguarundis were relatively common, but no one I spoke to at the station had seen them more than once.
The only diurnal mammals I saw during the day were the endemic Collie’s Squirrels, which were quite common, as were Coatis. I saw a large group one morning cross a steep little creek a kilometre from the station, while another was hanging around the back of the kitchen.
A colony of Grey Sac-winged Bats were roosting in a tunnel cut into the research station below the kitchen.
I saw a Common Long-tongued bat using it as a night roost too, along with some impressively large and scary looking Whip Spiders.
Small mammal trapping got more productive as the week went on.
I caught nothing on the first night, and then just a single Painted Spiny Pocket Mouse on the next two nights.
On the 4th night I caught several pocket mice along with a Jalisco Deer Mouse.
On the last night I added a couple of Michoacan Deer Mice to the list. I caught both in the bat tunnel where they were easy to see scurrying around, but hard to identify.
Ten hours or so of spotlighting by car and foot produced only a single Virginia Opposum. It was not easy to find a quiet stretch of road to go spotlighting along in the early evening (the gate into Chamela shuts at 9 p.m.). But there were mammals around. I found fresh Puma crap (or I guess it could have been Jaguar) just 100 metres from the research station itself.
I also looked for Mexican Cottontails along the highway south of Chamela, especially near the El Careyes Hotel gate (around KM 54) where they were supposedly present. I couldn’t see any.
In July 2015 Mexican (Red-bellied) Gray Squirrels were easy to spot in Chapultepec Park in the middle of Mexico City early in the morning. And Raccoon were I assume also common at night, judging by the amount of trash next to each rubbish bin in the park.
In 2018 a morning a Milpa Alta produced several Volcano Rabbits, Eastern Cottontails, a Mexican Cottontail and a Merriam’s Pocket Gopher. Small mammal trapping was productive with many Volcano Mice, and fewer Black-eared Deer Mice and Sumichrast’s Harvest Mice. I missed two Long-tailed Weasels that morning, which others in the group saw.
On the way back to the airport in 2018, I spotted a Mexican Ground Squirrel at Zoquiapan (which is now a different species to that in the SW USA).
In 2021 Smoky Pocket Gophers were easy to see at Ecatapec. There was an Eastern Cottontail there too plus a probable White-eared Cotton Mouse.
During a night in Mina in 2022 we saw an Allen’s Squirrel and Black-tailed Jackrabbits. We also caught Merriam’s Kangaroo Rats, White-ankled Mice and Nelson’s Pocket Mice in the desert outside town.
A long weekend trapping in Oaxaca in March 2018, with Mexican biologist Juan Cruzado was a lot of fun. Though rodent populations seemed quite low, we caught a few nice endemic rodents and some great bats too.
In 4 days we caught and saw Rock Squirrel; Osgood’s, Tehuantepec and Mexican Deer Mice; House Mouse; Hooded Skunk; Kinkajou; Sowell’s Short-tailed Bat; Northern & Honduran Yellow-shouldered Bats; Aztec & Toltec Fruit-eating Bats; Mexican Free-tailed Bat; Van Gelder’s Bat (mega!); Big Brown Bat; Allen’s & Little Yellow Bats and Cave & Northern Hairy-legged Myotis and Mexican & Eastern Cottontails.
I spent the last morning of my 2012 visit looking for dolphins on a boat trip arranged by Wildlife Connection out of Puerto Vallarta. They organise whale watching trips as well as swimming with Bottlenose Dolphins.
It was a fun trip. They told me they see Rough-toothed Dolphins occasionally, and our guide reckoned they were quite common further out. He thought the best way to see that species was to get a spot on a fishing boat.
A day on Cozumel Island in October 2015 produced -with the help of David Valenzuela and his colleagues – an endemic Cozumel (Pygmy) Raccoon and many of the Dwarf Coati subspecies. See my 2015 trip report.
The next day, in Puerto Aventuras, I saw Central American Agoutis, a Coati and my first Yucatan Squirrels. See my 2015 trip report.
In 2021 three nights of trapping in Mazatlan and Jinetes de los Machado found Painted Spiny Pocket Mouse and Sinaloan Pocket Mouse; along with Cactus Mouse, Mesquite Mouse, and Nayarit and Gleaning Deer Mice.
We saw Nine-banded Armadillo, Collie’s Squirrels and White-nosed Coatis as well as roosting Gray-Sac-winged, Waterhouse’s Leaf-nosed and Merriam’s Long-tongued Bats.
Bat netting was good, especially in Jinetes, and we had Waterhouse’s Leaf-nosed Bat; Merriam’s Long-tongued Bat; Little Yellow-shouldered Bat; Hairy, Jamaican, Great and Pygmy Fruit-eating Bats; and Little Yellow Bat.
In 2021 we caught Bailey’s Pocket Mice at Hermosillo and saw a couple of California Leaf-nosed Bats flying around. In Guayamas we caught a Desert Pocket Mouse and a Sonoran Woodrat.
I spent a weekend in 2020 batting near Tacotalpa and saw Thomas’s Sac-winged Bats, Common and White-winged Vampire Bats, Thomas’s Naked-backed Bat, Great and Jamaican Fruit-eating Bats and a Western Long-tonged Bat. We also saw Common, Virgina and Northern Four-eyed Opossums and caught some Big-eared Climbing Rats.
We saw quite 10 or more Perote Ground Squirrels during two mornings at Totalco in 2018, along with an Oriental Basin Pocket Gopher and many Rock Squirrels. I couldn’t find a Long-tailed Weasel, common in the area, but did see a White-sided Jackrabbit and a pair of Phillips’s Kangaroo Rats while spotlighting, along with several Silky Pocket Mice and Southern Deer Mice.
Small mammal trapping was off the charts, with nearly every trap full and most containing a Oaxacan Rock Deer Mouse. Those that didn’t had Southern Deer Mice, Mexican Spiny Pocket Mice, Western Harvest Mice and just two Perote Deer Mice.
An hour east of Totalco, in Rancho Viejo near Xalapa, we caught several Blackish Deer Mice, an Alfaro’s Rice Rat and a Northern Pygmy Rice Rat in 2018.