Knowledge & information
Consult this page for information on various topics such as care, parenting, nutrition, medical conditions, and more. Use the filter to narrow down the articles to just the topics you're looking for.

Nutritional errors casefile 6
Nutritional errors casefile 6: reproductive issues
drs. Jan Hooimeijer
25-08-2026

Cats
Stray cats helped - TNRC by Stichting Zwerfkat Nederland
Jan Hooimeijers reaction tot the figures from Stichting Zwerfkat Nederland regarding the number of cats that have been helped (neutered).
drs. Jan Hooimeijer
23-08-2026

Parrots
Nutritional errors casefile 5
Nutritional errors casefile 5: Junk Food Day. A dubious celebration of food that shouldn't be called food, but for us, the perfect moment to reflect on dietary mistakes once again.
drs. Jan Hooimeijer
08-07-2026
.jpg?crop&width=800&height=800)
drs. Jan Hooimeijer
01-06-2026
Cats
News article NRC
This article discusses the problem of stray cats in the countryside that pose a danger to meadow birds.
NRC
10-05-2026
Parrots
The power of the feeding branch
In nature, birds spend a large part of their day searching, processing and obtaining food. A feeding branch is a simple but powerful way to provide natural food in captivity.
drs. Jan Hooimeijer
27-02-2026

Other animals
The theme surrounding supplementary feeding of wild birds.
In this article I explain why supplementing wild birds with seed food is not in the interests of these birds.
drs.Jan Hooimeijer
19-02-2026
Other animals
Almost all of the world’s mammal biomass is humans and livestock
Almost all of the world’s mammal biomass is humans and livestock. This is an article that is frequently cited.
Hannah Ritchie & Fiona Spooner
09-01-2026

Parrots
Domestic violence in cockatoos part 2
It is a major problem worldwide that male cockatoos exhibit aggressive behavior towards the chrysalis. The results are injuries and even fatal consequences.
drs. Jan Hooimeijer
02-01-2026
Cats
Toxoplasmosis – Guideline (R.I.V.M.)
Toxoplasmosis is an infection caused by the parasite Toxoplasma gondii. Toxoplasmosis is spread worldwide exclusively by cats. Infection can occur orally or through vertical transmission.
drs. Jan Hooimeijer
04-12-2025

Other animals
Article from the AD about a headstrong little dog that takes itself for a walk.
This article explains the consequences of a headstrong little dog taking itself for a walk. The owner gets a ticket and receives a fine of €110.
Amarins Siccama
24-11-2025

drs. Jan Hooimeijer
18-08-2025

