Can you size up 52 animals, from a Panamanian golden frog to the blue whale?

Compare 36 mammals, 3 birds, 7 reptiles, 5 fish and 1 amphibian by the adult size their source gives: a length for most, a height for giraffe, elephant, ostrich, gorilla, okapi, zebra, orangutan and bald eagle, and a disc width for the giant manta ray. Each card names what is measured, and two animals are only paired when one is clearly bigger.

How to play

Two animals appear side by side (stacked on a phone). The first shows its size and what it measures, such as length or height; the second keeps its value hidden.
Decide whether the second one is larger or smaller and press Larger or Smaller.
The hidden value counts up and your answer is judged. When you are right, the second card moves across and a new one takes its place.
One wrong answer ends the run. There is no timer, and values stay fixed for the whole run. Pictures are not to scale. Two animals are only paired when one is at least 40% bigger and their published size ranges do not overlap. An “up to” size with no range counts as reaching down to half that size, and a height is only paired with a length when the smallest adults of one are at least twice the size of the largest of the other.
Your result is saved in this browser. Once enough people have played a game, the results also show how your score ranks, and you can copy or share an image of your result, or replay.

Understanding the comparison

Read what each card measures: a height runs from the ground up, while a whale’s or a crocodile’s length runs from nose to tail. A range covers the adults the source describes, often from smaller females to larger males, and “up to” is the largest adult size it gives.

All 52 animals, largest first

Show all 52 animals

Measured by length

Rank	Animal	Measured	Size	Imperial
1	Blue whale	Length	Up to 33.5 m	up to 110 ft
2	Fin whale	Length	22.9–25.9 m	75–85 ft
3	Humpback whale	Length	Up to 18.3 m	up to 60 ft
4	Sperm whale	Length	12.2–15.8 m	40–52 ft
5	Gray whale	Length	12.8–14.9 m	42–49 ft
6	Minke whale	Length	Up to 10.7 m	up to 35 ft
7	Whale shark	Common adult length	5.5–10 m	18–33 ft
8	Killer whale (orca)	Length	Up to 9.8 m	up to 32 ft
9	Green anaconda	Length	Up to 9 m	up to 30 ft
10	Giant manta ray	Disc width, fin tip to fin tip	Up to 7.9 m	up to 26 ft
11	Great white shark	Length	Up to 6.4 m	up to 21 ft
12	Narwhal	Length	4–5.5 m	13–18 ft
13	Hippopotamus	Length	3.3–5 m	11–16 ft
14	Saltwater crocodile	Average adult total length	3–5 m	9.8–16 ft
15	Beluga whale	Length	Up to 4.9 m	up to 16 ft
16	White rhinoceros	Length	3.7–4 m	12–13 ft
17	Atlantic bluefin tuna	Length	Up to 4 m	up to 13 ft
18	Bottlenose dolphin	Length	1.8–4 m	6–13 ft
19	Bactrian camel	Length	3.2–3.5 m	10–11 ft
20	American alligator	Average adult length	2.6–3.4 m	8.5–11 ft
21	Komodo dragon	Length	1.8–3 m	5.9–9.8 ft
22	Brown bear	Length	1.8–3 m	5.9–9.8 ft
23	Tiger	Length	1.5–2.9 m	4.9–9.5 ft
24	Polar bear	Head-and-body length	1.8–2.7 m	5.9–8.9 ft
25	Lion	Length	1.4–2.5 m	4.6–8.2 ft
26	Pacific halibut	Length	Up to 2.4 m	up to 8 ft
27	Hawaiian monk seal	Length	1.8–2.1 m	6–7 ft
28	Galápagos giant tortoise	Length, head to tail	Up to 1.83 m	up to 6 ft
29	Leatherback sea turtle	Adult length	1.5–1.8 m	5–6 ft
30	Giant panda	Length	1.5–1.8 m	4.9–5.9 ft
31	Jaguar	Length	1.1–1.8 m	3.6–5.9 ft
32	Red kangaroo	Body length	Up to 1.4 m	up to 4.6 ft
33	Cheetah	Body length	1–1.4 m	3.3–4.6 ft
34	Capybara	Length	1–1.3 m	3.3–4.3 ft
35	Green sea turtle	Adult length	0.91–1.22 m	3–4 ft
36	Giant anteater	Length	1–1.2 m	3.3–3.9 ft
37	Koala	Head-and-body length	60–80 cm	24–31 in
38	Two-toed sloth	Length	54–74 cm	21–29 in
39	Red panda	Length, not including the tail	51–64 cm	20–25 in
40	Fennec fox	Length	29–41 cm	11–16 in
41	Meerkat	Length	24–29 cm	9.4–11 in
42	Naked mole-rat	Usual length	About 7.5 cm	about 3 in
43	Panamanian golden frog	Length	3.5–6.3 cm	1.4–2.5 in
44	Bee hummingbird	Length	About 5 cm	about 2 in

Measured by height

Rank	Animal	Measured	Size	Imperial
1	Giraffe	Standing height	Up to 5.5 m	up to 18 ft
2	Elephant	Average shoulder height	2.4–3.2 m	7.9–10 ft
3	Ostrich	Height	1.7–2.7 m	5.6–8.9 ft
4	Gorilla	Standing height	Up to 1.75 m	up to 5.7 ft
5	Okapi	Height	About 1.5 m	about 4.9 ft
6	Zebra	Height	1.3–1.5 m	4.3–4.9 ft
7	Orangutan	Average height	1.14–1.36 m	3.7–4.5 ft
8	Bald eagle	Height	71–96 cm	28–38 in

Each size is the adult range or the largest (“up to”) adult size its source gives, ranked by its upper end. Heights and lengths measure different things, so they are ranked separately; a disc width counts as a length.

Frequently asked questions

What is the biggest animal in the game?

The blue whale, up to 33.5 m (up to 110 ft) long according to NOAA Fisheries. That is about 530 times the length of a 6.3 cm Panamanian golden frog, the smallest animal here.

What is the smallest animal in the game?

The Panamanian golden frog: adults measure 3.5–6.3 cm (1.4–2.5 in) according to Smithsonian’s National Zoo, so its smallest adults are shorter than any other animal here. Next comes the bee hummingbird, about 5 cm (about 2 in) long.

Which is the tallest animal?

The giraffe, up to 5.5 m (up to 18 ft) tall. It is measured by its standing height, while most animals here are measured by length.

What are the longest fish and reptile in the game?

The whale shark (5.5–10 m) is the longest fish, and the green anaconda (up to 9 m) the longest reptile, though that is the largest size its source gives; the saltwater crocodile’s 3–5 m is its average adult total length.

Why do some sizes show a range?

Animals vary, and males are often bigger than females. The game shows the range each source gives, or its “up to” size, and only pairs two animals when one is at least 40% bigger and their ranges do not overlap. An “up to” size with no range counts as reaching down to half that size, and a height is only paired with a length when the smallest adults of one are at least twice the size of the largest of the other.

Where the sizes come from

Each animal’s size comes from one source: San Diego Zoo Wildlife Alliance (28), NOAA Fisheries (17), Smithsonian’s National Zoo (4), Australian Museum (2) and Georgia Aquarium (1). Sizes given in feet are converted to metres, and both units appear on the cards.

Sources

Source: NOAA Fisheries, zoos and museums · Sources reviewed 2026-10-01

Each animal’s adult length or height is copied from the one source linked below; sizes given in feet are converted to metres. Photos come from Wikimedia Commons under the public domain or the CC licence credited in the game.

Found an incorrect answer or a source that needs updating? Send a correction with the game name and a reference.

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