Tiny GiantsTarsiers, Pygmy Fish and Other Small Pinoy Wonders

Adult Philippine tarsiers measure roughly 85–160 mm, and males weigh only about 80–160 g. Their thin, mostly bare tail is about twice the length of the body and helps them balance when they leap.

Each eye is enormous for its body. The Philippine tarsier has the highest eye-to-body-weight ratio of any mammal. Because the eyes cannot move, the neck does the work, turning the head about 180 degrees to track insects in the dark.

Researchers recorded Philippine tarsiers calling at about 70 kHz, far above the roughly 20 kHz limit of human hearing. They can also detect sounds above 90 kHz. To us, a tarsier that seems silent may actually be calling.

Primatologists Colin Groves and Myron Shekelle moved the species from Tarsius into the new genus Carlito, honoring Carlito Pizarras, a Boholano who spent decades protecting tarsiers and teaching visitors about them.

Tarsiers are nocturnal and easily stressed. Flash, handling and noise can lead them to harm themselves, sometimes fatally, because their skulls are thin. The species has been specially protected since Proclamation 1030 in 1997. The Philippine Tarsier Foundation runs a sanctuary in Corella, Bohol, where visitors watch quietly from trails.

Males mature at roughly 9 mm and reach about 11 mm. Females grow up to about 15 mm. A grown adult would fit across a single fingernail, which is why this goby became famous as one of the tiniest vertebrates known.

American ichthyologist Albert Herre described the species in 1927 from shaded riverbanks in Malabon. Reclamation later wiped out that original population. Since then, the goby has been found in other places, including Culion Island and estuaries around Puerto Princesa in Palawan.

Paedocypris progenetica, a tiny carp relative, matures at about 7.9 mm. The stout infantfish of Australia and the parasitic males of some deep-sea anglerfish are similarly small. Which fish counts as “the smallest” depends on how you measure, but the Philippine goby is still in the top tier.

Sinarapan (Mistichthys luzonensis) is a nearly transparent goby about the size of a grain of rice. It grows to about 2.5 cm at most. Bicolanos traditionally fried it or cooked it with vegetables and chili. Guinness listed it in 2001.

Fish sold as sinarapan in Lake Buhi were mostly larvae of ayungin and similar gobies. Introduced tilapia now dominates the lake, after decades of heavy fishing and fish-cage farming. Verified sinarapan was confirmed in Lake Manapao. The IUCN lists the species as Vulnerable.

This seahorse is usually smaller than 2 cm. It lives only on Muricella sea fans, 10–40 m deep. Bumps on its body copy the sea fan’s polyps so closely that it is almost impossible to spot unless you know where to look.

Georges Bargibant was examining a Muricella sea fan for the museum in Nouméa when he noticed two tiny seahorses wrapped around it. The species was formally named Hippocampus bargibanti the following year, 1970. Its camouflage is so good that nobody had spotted one on a reef before.

The female places her eggs in the male’s brood pouch, where he fertilizes and carries them for about two weeks. In one recorded pygmy seahorse birth, a male released 34 live young.

Ichthyologists Kent Carpenter and Victor Springer found that the Philippines sits at the heart of the Coral Triangle’s marine fish diversity, with the Verde Island Passage at its peak. In 2023, ocean nonprofit Mission Blue named it a Hope Spot.

The world’s largest fish survives on some of the ocean’s smallest food. Whale sharks swim with their wide mouths open, filtering plankton, fish eggs and small fish. That makes them gentle giants and a big draw for responsible tourism in places like Donsol.

Tragulus nigricans is found only on Balabac and a few small neighboring islands off southern Palawan. The IUCN lists it as Endangered, mainly because of habitat loss and hunting.

With an average shoulder height of about 18 cm and a body about 40–50 cm long, the pilandok is one of the smallest hoofed animals in the world. It is shy and nocturnal, hiding in dense forest by day and feeding on leaves and flowers.

Like other chevrotains, male mouse-deer have long, fang-like upper canines. They use them in fights over territory and mates, which makes this delicate animal tougher than it looks.

In one well-known Maranao tale, Pilandok tricks a prince into giving up his gold and then leaves him to face a swarm of angry bees. The Molbog people of southern Palawan regard the animal as sacred.

The tamaraw (Bubalus mindorensis) stands only about 100–105 cm at the shoulder. Its short, black horns form a V, while the water buffalo’s sweep into a C. It lives only on Mindoro and is the country’s largest native land mammal, despite being a dwarf among buffalo.

The count rose to 425 in 2026, but the tamaraw remains Critically Endangered. It once numbered in the thousands, before disease spread by introduced cattle hit it hard in the 1930s. October is Tamaraw Month under Proclamation 273 (2002).

Most Rafflesia flowers are known for their huge size, but R. consueloae averages only about 9.73 cm across. It was found in 2014 when a researcher tripped over a pile of rotting leaves. It was named after Consuelo Rufino Lopez, and its describers assessed it as Critically Endangered.

Rafflesia lives hidden inside its host vine for most of its life, drawing water and nutrients from it. It shows itself only when its bud breaks through and opens into a flower. R. consueloae grows only on the roots of a Tetrastigma vine.

After fertilization, the embryo implants but pauses its development for up to about eight months. It then finishes growing in about three more months. This endemic fruit bat has the longest known pregnancy of any bat.

After Cebu’s forests were cleared, the bird was feared extinct for most of the 20th century. It was rediscovered in 1992 in a patch of limestone forest in central Cebu. The IUCN lists it as Critically Endangered, with an estimated 85–105 birds left.