Plastic or metal travel carrier: which protects better in hot weather?
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Choosing a travel carrier is usually about size and price, rarely about the material itself. Yu, Chathuranga, Oketch, Hong, Park and Heo published a study in 2024 in the Journal of Animal Science and Technology that directly compares metal and plastic crates during transport in hot weather. It covers broiler chickens, but its findings shed light on a choice every bird owner eventually faces: which carrier material to prefer once heat is part of the equation. Our other transport criteria sit in the bird travel and safety section.
Contents · 5 sections
The protocol: two materials, one summer trip
Birds were transported early in the morning, over roughly 20 km at 30 to 50 km/h, under an ambient temperature of about 30°C and 40% relative humidity, split between metal crates and plastic crates of comparable dimensions. Blood samples were then used to measure several physiological markers of stress and metabolic effort.
Better glucose and lactate in plastic, unchanged cortisol
Birds transported in plastic crates showed lower blood glucose and lactate than those transported in metal crates, a signal of less metabolic effort spent fighting the heat. Cortisol, however, did not differ significantly by material: the plastic crate does not cancel transport stress, but it appears to lower its metabolic cost in hot weather.
A plausible explanation: thermal conduction
The study does not pin down the exact mechanism, but the most likely explanation lies in the thermal conductivity of the materials: metal transmits ambient heat and direct sunlight more readily than plastic, which can raise the perceived temperature inside the crate without necessarily showing up as a measurable cortisol gap over a trip of this length.
What this means for a companion bird's carrier
Without an equivalent study in pet psittacines or passerines, this data should be applied with caution, but it converges with an already documented risk: a carrier left in direct sun, covered in our article on a travel carrier left in a sun-baked car. Choosing the carrier's material and model more broadly is covered in our guide to the bird travel cage or carrier bag.
- Trip tested: about 20 km, 30-50 km/h, 30°C, 40% relative humidity.
- Glucose and lactate: lower in plastic crates than in metal ones.
- Cortisol: no significant difference by material.
- Study conducted on broiler chickens, to be applied to companion birds with caution.
In hot weather, a plastic carrier therefore looks at least as safe a choice as a metal one, though that doesn't remove the need for basic precautions: shade, ventilation and supervision remain the best-established defenses against heatstroke.
Frequently asked questions
Is a plastic carrier always better than a metal one?
This study suggests so in hot weather, on specific metabolites, but it does not conclude that plastic is superior across all transport conditions.
Cortisol doesn't move — is transport stress negligible then?
No, cortisol captures one dimension of stress among others. Glucose and lactate here reflect the metabolic effort of thermoregulation, a distinct and equally concrete aspect.
Do these results apply directly to parrots or canaries?
Not directly: the study covers broiler chickens. It offers a clue about the role of carrier material, not species-validated data for companion birds.
In our shop, for this use: Parrot outdoor harness with elastic lead (€25.90) · the whole shop
This guide is part of Planète Pets’s Birds universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.
